tcolorbox

git-svn-id: svn://tug.org/texlive/trunk@29279 c570f23f-e606-0410-a88d-b1316a301751

13 files changed, 3249 insertions, 342 deletions

diff --git a/Master/texmf-dist/doc/latex/tcolorbox/Basilica_5.png b/Master/texmf-dist/doc/latex/tcolorbox/Basilica_5.png
new file mode 100644
index 00000000000..1a9f191001d
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/tcolorbox/Basilica_5.png
diff --git a/Master/texmf-dist/doc/latex/tcolorbox/CHANGES b/Master/texmf-dist/doc/latex/tcolorbox/CHANGES
index 121d9a42791..f11ff014d33 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/CHANGES
+++ b/Master/texmf-dist/doc/latex/tcolorbox/CHANGES
@@ -1,4 +1,4 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)

+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)

 %%

 %% -------------------------------------------------------------------------------------------

 %% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>

@@ -69,4 +69,35 @@ version 1.30 (2012/04/20)
   'frame code', 'interior titled code', 'interior code', 'segmentation code',

   'colbacklower'

 

+version 2.00 (2013/03/01)

+- breaking news: the new library 'breakable' add breaking support to tcolorbox.

+- e-TeX now used instead of calc

+- new key 'adjust text' and new implementation for 'adjusted title'

+- new geometry keys:

+  'toprule', 'toprule at break', 'bottomrule', 'bottomrule at break',

+  'leftrule', 'rightrule', 'titlerule', 'outer arc', 'auto outer arc',

+  'toptitle', 'bottomtitle'

+- new bounding box keys:

+  'enlarge top at break by', 'enlarge bottom at break by'

+- new overlay keys:

+  'overlay', 'no overlay', 'overlay broken', 'overlay unbroken',

+  'overlay first', 'overlay middle', 'overlay last',

+  'overlay unbroken and first', 'overlay middle and last'

+- new key: 'parbox' to change text behaviour

+- new library 'breakable' for breakable boxes with the new keys:

+  'breakable', 'unbreakable', 'title after break', 'notitle after break',

+  'adjusted title after break', 'lines before break', 'shrink break goal'

+- new keys for the 'skins' library

+  'skin first', 'skin middle', 'skin last', 'title engine', 'pathfirst',

+  'pathmiddle', 'pathlast', 'title style', 'title code', 'enhancedfirst',

+  'enhancedmiddle', 'enhancedlast', 'enhanced', 'marker', 'bicolor',

+  'bicolorfirst', 'bicolormiddle', 'bicolorlast', 'beamer',

+  'beamerfirst', 'beamermiddle', 'beamerlast', 'draft', 'freelance', 'standard'

+- NOTE: skins 'beamer' and 'widget' changed

+  use the new style options 'beamer' and 'widget' to get the old appearance

+- new watermark keys:

+  'watermark text', 'watermark text on', 'watermark graphics',

+  'watermark graphics on', 'watermark tikz', 'watermark tikz on',

+  'no watermark', 'watermark opacity', 'watermark color',

+  'watermark zoom', 'watermark stretch',

 

diff --git a/Master/texmf-dist/doc/latex/tcolorbox/README b/Master/texmf-dist/doc/latex/tcolorbox/README
index ed65b1ad367..217e6249343 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/README
+++ b/Master/texmf-dist/doc/latex/tcolorbox/README
@@ -1,7 +1,7 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
@@ -29,15 +29,17 @@ Contents of the package
   'README'                    this file
   'CHANGES'                   log of changes (history)
   'tcolorbox.sty'             LaTeX package file (style file)
-  'tcblistings.code.tex'      LaTeX package file (library of tcolorbox)
-  'tcbtheorems.code.tex'      LaTeX package file (library of tcolorbox)
+  'tcbbreakable.code.tex'     LaTeX package file (library of tcolorbox)
   'tcbdocumenation.code.tex'  LaTeX package file (library of tcolorbox)
+  'tcblistings.code.tex'      LaTeX package file (library of tcolorbox)
   'tcbskins.code.tex'         LaTeX package file (library of tcolorbox)
+  'tcbtheorems.code.tex'      LaTeX package file (library of tcolorbox)
   'tcolorbox.pdf'             Documentation for tcolorbox
   'tcolorbox.tex'             Source code of the documentation
   'tcolorbox-example.tex'     Example file for package usage
   'tcolorbox-example.pdf'     Compiled example
   'tcolorbox-german.pdf'      Outdated documentation in German
+  'Basilica_5.png'            Example picture
 
 Installation
 ============
@@ -45,8 +47,9 @@ Copy the contents of the 'tcolorbox.tds.zip' from CTAN to your local TeX file tr
 
 Alternatively, put the files to their respective locations within the TeX installation:
   'tcolorbox.sty'             ->  /tex/latex/tcolorbox
+  'tcbbreakable.code.tex'     ->  /tex/latex/tcolorbox
+  'tcbdocumenation.code.tex'  ->  /tex/latex/tcolorbox
   'tcblistings.code.tex'      ->  /tex/latex/tcolorbox
   'tcbtheorems.code.tex'      ->  /tex/latex/tcolorbox
-  'tcbdocumenation.code.tex'  ->  /tex/latex/tcolorbox
   'tcbskins.code.tex'         ->  /tex/latex/tcolorbox
   all other files             ->  /doc/latex/tcolorbox
diff --git a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.pdf b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.pdf
index 341d08f4128..22711a6773e 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.pdf
+++ b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.pdf
diff --git a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.tex b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.tex
index 0c5bf93b51c..67b4a3da847 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.tex
+++ b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox-example.tex
@@ -1,8 +1,8 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcolorbox-example.tex: an example for tcolorbox
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
@@ -18,7 +18,8 @@
 %% This work consists of all files listed in README
 %%
 \documentclass{article}
-\usepackage[listings,theorems]{tcolorbox}
+\usepackage{tikz,lipsum}
+\usepackage[listings,theorems,skins,breakable]{tcolorbox}
 
 \tcbset{noparskip}
 
@@ -27,39 +28,39 @@
 %----------------------------------------------------------
 \section{Colored boxes}
 
-\begin{tcolorbox}[colback=red!5,colframe=red!75!black]
+\begin{tcolorbox}[colback=red!5!white,colframe=red!75!black]
   My box.
 \end{tcolorbox}
 
-\begin{tcolorbox}[colback=blue!5,colframe=blue!75!black,title=My title]
+\begin{tcolorbox}[colback=blue!5!white,colframe=blue!75!black,title=My title]
   My box with my title.
 \end{tcolorbox}
 
-\begin{tcolorbox}[colback=green!5,colframe=green!75!black]
+\begin{tcolorbox}[colback=green!5!white,colframe=green!75!black]
   Upper part of my box.
   \tcblower
   Lower part of my box.
 \end{tcolorbox}
 
-\begin{tcolorbox}[colback=yellow!5,colframe=yellow!75!black,title=My title]
+\begin{tcolorbox}[colback=yellow!5!white,colframe=yellow!75!black,title=My title]
   I can do this also with a title.
   \tcblower
   Lower part of my box.
 \end{tcolorbox}
 
-\begin{tcolorbox}[colback=yellow!10,colframe=red!75!black,lowerbox=invisible,
+\begin{tcolorbox}[colback=yellow!10!white,colframe=red!75!black,lowerbox=invisible,
   savelowerto=\jobname_ex.tex]
   Now, we play hide and seek. Where is the lower part?
   \tcblower
   I'm invisible until you find me.
 \end{tcolorbox}
 
-\begin{tcolorbox}[colback=yellow!10,colframe=red!75!black,title=Here I am]
+\begin{tcolorbox}[colback=yellow!10!white,colframe=red!75!black,title=Here I am]
   \input{\jobname_ex.tex}
 \end{tcolorbox}
 
 
-\begin{tcolorbox}[colback=blue!50,colframe=blue!25!black,coltext=yellow,
+\begin{tcolorbox}[colback=blue!50!white,colframe=blue!25!black,coltext=yellow,
     fontupper=\Large\bfseries,arc=6mm,boxrule=2mm,boxsep=5mm]
   Funny settings.
 \end{tcolorbox}
@@ -69,7 +70,7 @@
 %----------------------------------------------------------
 \section{\LaTeX-Examples}
 
-\begin{tcblisting}{colback=red!5,colframe=red!75!black}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black}
 This is a \LaTeX\ example:
 $\displaystyle\sum\limits_{i=1}^n i = \frac{n(n+1)}{2}$.
 \end{tcblisting}
@@ -82,7 +83,7 @@ $\displaystyle\sum\limits_{i=1}^n i = \frac{n(n+1)}{2}$.
 \def\themytheorem{\thesection.\arabic{mytheorem}}
 
 \tcbmaketheorem{theo}{Theorem}{fonttitle=\bfseries\upshape, fontupper=\slshape,
-     arc=0mm, colback=blue!5,colframe=blue!75!black}{mytheorem}{theorem}
+     arc=0mm, colback=blue!5!white,colframe=blue!75!black}{mytheorem}{theorem}
 
 \begin{theo}{Summation of Numbers}{summation}
   For all natural number $n$ it holds:\\[2mm]
@@ -91,5 +92,29 @@ $\displaystyle\sum\limits_{i=1}^n i = \frac{n(n+1)}{2}$.
 
 We have given Theorem \ref{theorem:summation} on page \pageref{theorem:summation}.
 
+
+%----------------------------------------------------------
+\section{Watermarks}
+
+\begin{tcolorbox}[enhanced,watermark graphics=Basilica_5.png,
+  watermark opacity=0.3,watermark zoom=0.9,
+  colback=green!5!white,colframe=green!75!black,
+  fonttitle=\bfseries, title=Box with a watermark picture]
+  Here, you see my nice box with a picture as a watermark.
+  This picture is automatically resized to fit the dimensions
+  of my box. Instead of a picure, some text could be used or
+  arbitrary graphical code. See the documentation for more options.
+\end{tcolorbox}
+
+%----------------------------------------------------------
+\section{Breakable Boxes}
+
+\begin{tcolorbox}[enhanced,breakable,
+  colback=blue!5!white,colframe=blue!75!black,title=Breakable box,
+  watermark color=white,watermark text=\Roman{tcbbreakpart}]
+  \lipsum[1-18]
+\end{tcolorbox}
+
+
 \end{document}
 
diff --git a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.pdf b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.pdf
index 3981d2ab065..2a7701620ad 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.pdf
+++ b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.pdf
diff --git a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.tex b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.tex
index bcd06a4d6cd..1f6ed365176 100644
--- a/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.tex
+++ b/Master/texmf-dist/doc/latex/tcolorbox/tcolorbox.tex
@@ -1,9 +1,9 @@
 % \LaTeX-Main\
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcolorbox.tex: Manual
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
@@ -43,8 +43,8 @@
 \tolerance=2000%
 \setlength{\emergencystretch}{20pt}%
 
-\RequirePackage{csquotes}
-\RequirePackage[style=numeric-comp,sorting=nyt,
+\usepackage{csquotes}
+\usepackage[style=numeric-comp,sorting=nyt,
   maxnames=8,minnames=8,abbreviate=false,backend=biber]{biblatex}
 \DeclareFieldFormat{url}{\newline\url{#1}}%
 \DeclareListFormat{language}{}%
@@ -53,8 +53,13 @@
 
 \usetikzlibrary{shadings,shadows}
 \usetikzlibrary{decorations.pathmorphing}
+\usetikzlibrary{patterns}
 
-\usepackage[listings,theorems,documentation,skins]{tcolorbox}
+\usepackage{lipsum}
+
+\usepackage[listings,theorems,documentation,skins,breakable]{tcolorbox}
+%\tcbset{skin=enhanced,breakable}
+\tcbset{skin=enhanced}
 
 \tcbmakedocSubKey{docTcbKey}{tcb}
 \tcbmakedocSubKey{langTcbKey}{tcb/doclang}
@@ -67,6 +72,7 @@
 \def\refSkin#1{\ref@doc{skin:#1}}
 \makeatother
 
+\newenvironment{marker}[1][]{\begin{tcolorbox}[marker,#1]}{\end{tcolorbox}}
 
 \hypersetup{
   pdftitle={Manual for the tcolorbox package},
@@ -75,8 +81,8 @@
   pdfkeywords={colored boxes, LaTeX examples, theorems}
 }
 
-\def\version{1.30}%
-\def\datum{2012/04/20}%
+\def\version{2.00}%
+\def\datum{2013/03/01}%
 \makeindex
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -101,14 +107,21 @@
   saving and reuse of source code and text parts.
 \end{absquote}
 
-
-\tableofcontents
-
+\begin{tcolorbox}[breakable,skin=enhanced,title={Contents},fonttitle=\bfseries\Large,
+  colback=yellow!10!white,colframe=red!50!black,before=\par\bigskip\noindent,
+  watermark color=yellow!75!red!25!white,
+  watermark text={\bfseries\Large Contents},
+  frame style={drop shadow}
+  ]
+\makeatletter
+\@starttoc{toc}
+\makeatother
+\end{tcolorbox}
 
 \clearpage
 \section{Introduction}
 The package originates from the first edition of my book
-\flqq{\citetitle{sturm:2011b}\frqq~\cite{sturm:2011b}
+\flqq{\citetitle{sturm:2012k}\frqq~\cite{sturm:2012k}
 in about 2006.
 For the \LaTeX\ examples and tutorials given there, I wanted to have
 accentuated and colored boxes to display source code and
@@ -119,10 +132,18 @@ mathematics \cite{sturm:2007b,sturm:2008b,sturm:2010a}
 as well.
 With this package, you are invited to apply these boxes for similar projects.
 
+Starting with version 2.00, all internal calculations are not longer performed
+by the package |calc| \cite{thorub:2007a} but
+by $\varepsilon$-\TeX\ \cite{breitenlohner:1998a} expressions since
+$\varepsilon$-\TeX\ is assumed to be used by everybody (hopefully).
+The breaking news for version 2.00 is the support for breakable boxes.
+This new feature allows new applications of the package without
+affecting the core package too much if you do not need boxes to break automatically.
+
 
 \subsection{Loading the Package}
 The base package |tcolorbox| loads the packages
-|pgf| \cite{tantau:2010c}, |calc| \cite{thorub:2007a}, and |verbatim| \cite{schoepf:2001a}.
+|pgf| \cite{tantau:2010c} and |verbatim| \cite{schoepf:2001a}.
 |tcolorbox| itself is loaded in the usual manner in the preamble:
 \begin{dispListing}
 \usepackage{tcolorbox}
@@ -136,9 +157,10 @@ For example, the key to typeset listings is:
 \end{dispListing}
 
 
+\clearpage
 \subsection{Libraries}\label{sec:bibliothek}
 The base package |tcolorbox| is extendable by program libraries.
-This is done by usage of option keys while loading the package or inside
+This is done by using option keys while loading the package or inside
 the preamble by applying the following macro with the same set of keys.
 
 \begin{docCommand}{tcbuselibrary}{\marg{key list}}
@@ -176,6 +198,12 @@ The following keys are used inside |\tcbuselibrary| respectively
   section \ref{sec:skins} from page \pageref{sec:skins}.
 \end{docTcbKey}
 
+\begin{docTcbKey}[library]{breakable}{}{no value}
+  Provides support for automatic box breaking from one page to another;
+  see section \ref{sec:breakable} from page \pageref{sec:breakable}.
+\end{docTcbKey}
+
+
 
 \clearpage
 \section{Macros for Box Creation}
@@ -222,7 +250,7 @@ see section \ref{sec:optkeys} for the complete list.
 A quick example is given here:
 
 \begin{dispExample}
-\begin{tcolorbox}[colback=red!5,colframe=red!75!black,title=My nice heading]
+\begin{tcolorbox}[colback=red!5!white,colframe=red!75!black,title=My nice heading]
 This is another \textbf{tcolorbox}.
 \tcblower
 Here, you see the lower part of the box.
@@ -241,7 +269,7 @@ Here, you see the lower part of the box.
   Sets options for every following \refEnv{tcolorbox} inside the current \TeX\ group.
   For example, the colors of the boxes may be defined for the whole document by this:
 \begin{dispListing}
-\tcbset{colback=red!5,colframe=red!75!black}
+\tcbset{colback=red!5!white,colframe=red!75!black}
 \end{dispListing}
 \end{docCommand}
 
@@ -251,7 +279,7 @@ Here, you see the lower part of the box.
 For the \meta{options} in \refEnv{tcolorbox} respectively \refCom{tcbset}
 the following |pgf| keys can be applied. The key tree path |/tcb/| is not to
 be used inside these macros. It is easy to add your own style keys using
-the syntax for |pgf| keys, see \cite{tantau:2010c,sturm:2011b} or the examples
+the syntax for |pgf| keys, see \cite{tantau:2010c,sturm:2012k} or the examples
 starting from page \pageref{sec:latextutorial}.
 
 
@@ -272,7 +300,8 @@ This is a \textbf{tcolorbox}.
 
 \begin{docTcbKey}{adjusted title}{=\meta{text}}{style, no default, initially unset}
   Creates a heading line with \meta{text} as content. The minimal height of
-  this line is adjusted to fit the text '\"Apgjy'. This option makes sense
+  this line is adjusted to fit the text given by \refKey{/tcb/adjust text}.
+  This option makes sense
   for single line headings if boxes are set side by side with equal height.
   Note that it is very easy to trick this adjustment.
 \begin{dispExample}
@@ -291,6 +320,13 @@ Now, we try again with adjusted titles:\\
 \end{docTcbKey}
 
 
+\begin{docTcbKey}{adjust text}{=\meta{text}}{no default, initially \texttt{\"Apgjy}}
+  This sets the reference text for \refKey{/tcb/adjusted title}. If your texts
+  never exceed '\"Apgjy' in depth and height you don't need to care about this option.
+\end{docTcbKey}
+
+
+
 \clearpage
 \subsection{Lower Part}
 \begin{docTcbKey}{lowerbox}{=\meta{mode}}{no default, initially \texttt{visible}}
@@ -303,13 +339,13 @@ Now, we try again with adjusted titles:\\
   \end{itemize}
   The last two values are usually applied in connection with |savelowerto|.
 \begin{dispExample}
-\begin{tcolorbox}[lowerbox=invisible]
+\begin{tcolorbox}[lowerbox=invisible,colback=white]
 This is a \textbf{tcolorbox}.
 \tcblower
 This is the lower part (but invisible).
 \end{tcolorbox}
 
-\begin{tcolorbox}[lowerbox=ignored]
+\begin{tcolorbox}[lowerbox=ignored,colback=white]
 This is a \textbf{tcolorbox}.
 \tcblower
 This is the lower part (but ignored).
@@ -321,7 +357,7 @@ This is the lower part (but ignored).
 \begin{docTcbKey}{savelowerto}{=\meta{file name}}{no default, initially empty}
   Saves the content of the lower box in a file for an optional later usage.
 \begin{dispExample}
-\begin{tcolorbox}[lowerbox=invisible,savelowerto=\jobname_bspsave.tex]
+\begin{tcolorbox}[lowerbox=invisible,savelowerto=\jobname_bspsave.tex,colback=white]
 This is a \textbf{tcolorbox}.
 \tcblower
 This is the lower part which may be quite complex:
@@ -347,7 +383,7 @@ Now, we load the saved text:\\
   \tcolorbox[savedelimiter=mybox,
              savelowerto=\jobname_bspsave2.tex,
              lowerbox=ignored,
-             colback=red!5,colframe=red!75!black,fonttitle=\bfseries,title=#1]}%
+             colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries,title=#1]}%
   {\endtcolorbox}
 
 \begin{mybox}{My Example}
@@ -464,6 +500,11 @@ This is a \textbf{tcolorbox}.
 \end{dispExample}
 \end{docTcbKey}
 
+\bigskip
+\begin{marker}
+  More color options are provided by using skins documented in
+  Section \ref{sec:skins} from page \pageref{sec:skins}.
+\end{marker}
 
 \clearpage
 \subsection{Geometry}
@@ -471,6 +512,8 @@ This is a \textbf{tcolorbox}.
   Sets the total width of the colored box to \meta{length}.
   See also \refKey{/tcb/height}.
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[width=\linewidth/2]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -478,19 +521,99 @@ This is a \textbf{tcolorbox}.
 \end{docTcbKey}
 
 
-\begin{docTcbKey}{boxrule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
-  Sets the frame width to \meta{length}.
+\begin{docTcbKey}{toprule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the top rule to \meta{length}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[toprule=3mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{toprule at break}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the top rule to \meta{length} \emph{if} the box is \refKey{/tcb/breakable}.
+  In this case, it is applied to \emph{middle} and \emph{last} parts in a
+  break sequence. Note that \refKey{/tcb/toprule} overwrites this value
+  if used afterwards.
+\end{docTcbKey}
+
+\begin{docTcbKey}{bottomrule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the bottom rule to \meta{length}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[bottomrule=3mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{bottomrule at break}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the bottom rule to \meta{length} \emph{if} the box is \refKey{/tcb/breakable}.
+  In this case, it is applied to \emph{first} and \emph{middle} parts in a
+  break sequence. Note that \refKey{/tcb/bottomrule} overwrites this value
+  if used afterwards.
+\end{docTcbKey}
+
+\clearpage
+\begin{docTcbKey}{leftrule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the left rule to \meta{length}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\clearpage
+\begin{tcolorbox}[leftrule=3mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{rightrule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the right rule to \meta{length}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[rightrule=3mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{titlerule}{=\meta{length}}{no default, initially \texttt{0.5mm}}
+  Sets the line width of the rule below the title to \meta{length}.
 \begin{dispExample}
-\begin{tcolorbox}[boxrule=2mm]
+\tcbset{colback=red!5!white,colframe=red!75!black,enhanced,
+  title style={fill=red!90!black}}
+
+\begin{tcolorbox}[titlerule=3mm,title=This is the title]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
 \end{dispExample}
 \end{docTcbKey}
 
 
+\begin{docTcbKey}{boxrule}{=\meta{length}}{style, no default, initially \texttt{0.5mm}}
+  Sets all rules of the frame to \meta{length}, i.\,e.\ 
+  \refKey{/tcb/toprule}, \refKey{/tcb/bottomrule}, \refKey{/tcb/leftrule},
+  \refKey{/tcb/rightrule}, and \refKey{/tcb/titlerule}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[boxrule=3mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\clearpage
 \begin{docTcbKey}{arc}{=\meta{length}}{no default, initially \texttt{1mm}}
-  Sets the radius of the four frame arcs to \meta{length}.
+  Sets the inner radius of the four frame arcs to \meta{length}.
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[arc=0mm]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -500,14 +623,39 @@ This is a \textbf{tcolorbox}.
 \end{dispExample}
 \end{docTcbKey}
 
+
+\begin{docTcbKey}{outer arc}{=\meta{length}}{no default, initially unset}
+  Sets the outer radius of the four frame arcs to \meta{length}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[arc=4mm,outer arc=1mm]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{auto outer arc}{}{no value, initially set}
+  Sets the outer radius of the four frame arcs automatically in
+  dependency of the inner radius given by \refKey{/tcb/arc}.
+\end{docTcbKey}
+
+
 \begin{docTcbKey}{boxsep}{=\meta{length}}{no default, initially \texttt{1mm}}
   Sets a common padding of \meta{length} between the text content and the
   frame of the box. This value is added to the key values of
   |left|, |right|, |top|, |bottom|, and |middle| at the appropriate places.
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,width=(\linewidth-4mm)/2,
+  before=,after=\hfill}
+
 \begin{tcolorbox}[boxsep=5mm]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
+\begin{tcolorbox}[boxsep=5mm,draft]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
 \end{dispExample}
 \end{docTcbKey}
 
@@ -518,6 +666,8 @@ This is a \textbf{tcolorbox}.
   This is an abbreviation for setting
   |lefttitle|, |leftupper|, and |leftlower| to the same value.
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[left=0mm]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -527,6 +677,8 @@ This is a \textbf{tcolorbox}.
 \begin{docTcbKey}{lefttitle}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the left space between title text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[lefttitle=3cm,title=My Title]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -536,6 +688,8 @@ This is a \textbf{tcolorbox}.
 \begin{docTcbKey}{leftupper}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the left space between upper text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[leftupper=3cm,title=My Title]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -545,6 +699,8 @@ This is a \textbf{tcolorbox}.
 \begin{docTcbKey}{leftlower}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the left space between lower text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[leftlower=3cm]
 This is a \textbf{tcolorbox}.
 \tcblower
@@ -560,6 +716,8 @@ This is the lower part.
   This is an abbreviation for setting
   |righttitle|, |rightupper|, and |rightlower| to the same value.
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[width=5cm,right=2cm]
 This is a \textbf{tcolorbox}.
 \end{tcolorbox}
@@ -571,6 +729,8 @@ This is a \textbf{tcolorbox}.
 \begin{docTcbKey}{righttitle}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the right space between title text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[width=5cm,righttitle=2cm,title=My very long title text]
 This is a \textbf{tcolorbox} with standard upper box dimensions.
 \end{tcolorbox}
@@ -581,6 +741,8 @@ This is a \textbf{tcolorbox} with standard upper box dimensions.
 \begin{docTcbKey}{rightupper}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the right space between upper text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[width=5cm,rightupper=2cm,title=My very long title text]
 This is a \textbf{tcolorbox} with compressed upper box dimensions.
 \end{tcolorbox}
@@ -592,6 +754,8 @@ This is a \textbf{tcolorbox} with compressed upper box dimensions.
 \begin{docTcbKey}{rightlower}{=\meta{length}}{no default, initially \texttt{4mm}}
   Sets the right space between lower text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[width=5cm,rightlower=2cm]
 This is a \textbf{tcolorbox} with standard upper box dimensions.
 \tcblower
@@ -605,6 +769,8 @@ This is the lower part with large space at right.
 \begin{docTcbKey}{top}{=\meta{length}}{no default, initially \texttt{2mm}}
   Sets the top space between text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[top=0mm]
 This is a \textbf{tcolorbox}.
 \tcblower
@@ -613,9 +779,24 @@ This is the lower part.
 \end{dispExample}
 \end{docTcbKey}
 
+
+\begin{docTcbKey}{toptitle}{=\meta{length}}{no default, initially \texttt{0mm}}
+  Sets the top space between title and frame (additional to |boxsep|).
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[toptitle=3mm,title=My title]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\clearpage
 \begin{docTcbKey}{bottom}{=\meta{length}}{no default, initially \texttt{2mm}}
   Sets the bottom space between text and frame (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[bottom=0mm]
 This is a \textbf{tcolorbox}.
 \tcblower
@@ -624,12 +805,24 @@ This is the lower part.
 \end{dispExample}
 \end{docTcbKey}
 
+\begin{docTcbKey}{bottomtitle}{=\meta{length}}{no default, initially \texttt{0mm}}
+  Sets the bottom space between title and frame (additional to |boxsep|).
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[bottomtitle=3mm,title=My title]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
 
-\clearpage
 \begin{docTcbKey}{middle}{=\meta{length}}{no default, initially \texttt{2mm}}
   Sets the space between upper and lower text to the separation line
   (additional to |boxsep|).
 \begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
 \begin{tcolorbox}[middle=0mm,boxsep=0mm]
 This is a \textbf{tcolorbox}.
 \tcblower
@@ -639,12 +832,20 @@ This is the lower part.
 \end{docTcbKey}
 
 
-
+\clearpage
 \subsection{Height Control}
 In a typical usage scenario, the height of a |tcolorbox| is computed automatically
 to fit the content. Nevertheless, the height can be set to a fixed value
 or to fit commonly for several boxes, e.\,g. if boxes are set side by side.
 
+\bigskip
+\begin{marker}
+  The height control keys are only applicable to unbreakable boxes.
+  If a box is set to be \refKey{/tcb/breakable}, the height is always
+  computed according to the \emph{natural height}.
+\end{marker}
+\bigskip
+
 
 \begin{docTcbKey}{natural height}{}{no value, initially set}
   Sets the total height of the colored box to its natural height depending
@@ -848,18 +1049,132 @@ with a listing.
 
 
 \clearpage
+\subsection{Overlays}\label{subsec:overlays}
+With an overlay, arbitrary \meta{graphical code} can be added to a
+|tcolorbox|. This code is executed \emph{after} the frame and interior are
+drawn and \emph{before} the text content is drawn. Therefore, you can
+decorate the |tcolorbox| with your own extensions.
+Common special cases are \emph{watermarks} which are implemented using overlays.
+See Subsection \ref{subsec:watermarks} from page \pageref{subsec:watermarks} if
+you want to add \emph{watermarks}.
+\begin{marker}
+If you use the core package only, the \meta{graphical code} has to be |pgf| code
+and there is not much assistance for positioning.
+Therefore, the usage of the \refKey{/tcb/enhanced} mode from the library skins
+is recommended which allows |tikz| code and gives access to
+\refKey{/tcb/geometry nodes} for positioning.
+\end{marker}
+
+\begin{docTcbKey}{overlay}{=\meta{graphical code}}{no default, initially unset}
+  Adds \meta{graphical code} to the box drawing process. This \meta{graphical code}
+  is drawn \emph{after} the frame and interior and \emph{before} the text content.
+
+\begin{dispExample}
+% \tcbuselibrary{skins} % preamble
+\tcbset{frogbox/.style={enhanced,colback=green!10,colframe=green!65!black,
+  enlarge top by=5.5mm,
+  overlay={\foreach \x in {2cm,3.5cm} {
+    \begin{scope}[shift={([xshift=\x]frame.north west)}]
+      \path[draw=green!65!black,fill=green!10,line width=1mm] (0,0) arc (0:180:5mm);
+      \path[fill=black] (-0.2,0) arc (0:180:1mm);
+    \end{scope}}}]}}
+
+\begin{tcolorbox}[frogbox,title=My title]
+This is a \textbf{tcolorbox}.
+\end{tcolorbox}
+\end{dispExample}
+
+\begin{dispExample}
+% \usetikzlibrary{patterns} % preamble
+% \tcbuselibrary{skins}     % preamble
+\tcbset{ribbonbox/.style={enhanced,colback=red!5!white,colframe=red!75!black,
+  fonttitle=\bfseries,
+  overlay={\path[fill=blue!75!white,draw=blue,double=white!85!blue,
+    preaction={opacity=0.6,fill=blue!75!white},
+    line width=0.1mm,double distance=0.2mm,
+    pattern=fivepointed stars,pattern color=white!75!blue]
+    ([xshift=-0.2mm,yshift=-1.02cm]frame.north east)
+    -- ++(-1,1) -- ++(-0.5,0) -- ++(1.5,-1.5) -- cycle;}}}
+
+\begin{tcolorbox}[ribbonbox,title=My title]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{no overlay}{}{style, no default, initially set}
+  Removes the overlay if set before.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay broken}{=\meta{graphical code}}{no default, initially unset}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the \meta{graphical code} is added to the box drawing process.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay unbroken}{=\meta{graphical code}}{no default, initially unset}
+  If the box is set to be \refKey{/tcb/breakable} but \emph{is not} broken actually
+  or if the box is set to be \refKey{/tcb/unbreakable},
+  then the \meta{graphical code} is added to the box drawing process.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay first}{=\meta{graphical code}}{no default, initially unset}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the \meta{graphical code} is added to the box drawing process for
+  the \emph{first} part of the break sequence.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay middle}{=\meta{graphical code}}{no default, initially unset}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the \meta{graphical code} is added to the box drawing process for
+  the \emph{middle} parts (if any) of the break sequence.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay last}{=\meta{graphical code}}{no default, initially unset}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the \meta{graphical code} is added to the box drawing process for
+  the \emph{last} part of the break sequence.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay unbroken and first}{=\meta{graphical code}}{no default, initially unset}
+  This is an optimized abbreviation for setting
+  \refKey{/tcb/overlay unbroken} and
+  \refKey{/tcb/overlay first} together.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+\begin{docTcbKey}{overlay middle and last}{=\meta{graphical code}}{no default, initially unset}
+  This is an optimized abbreviation for setting
+  \refKey{/tcb/overlay middle} and
+  \refKey{/tcb/overlay last} together.
+  \refKey{/tcb/overlay} overwrites this key.
+\end{docTcbKey}
+
+
+
+\clearpage
 \subsection{Floating Objects}
 \begin{docTcbKey}{floatplacement}{=\meta{values}}{no default, initially \texttt{htb}}
   Sets \meta{values} as default values for the usage of |float|.
   Feasible are the usual parameters for floating objects.
 \begin{dispListing}
+\tcbset{enhanced,colback=red!5!white,colframe=red!75!black,
+   watermark color=red!15!white}
+
 \begin{tcolorbox}[floatplacement=t,float,
-                  title=Floating box from |floatplacement|]
+                  title=Floating box from |floatplacement|,
+                  watermark text={I am floating}]
   This floating box is placed at the top of a page.
 \end{tcolorbox}
 \end{dispListing}
-\tcbusetemp
 \end{docTcbKey}
+{\tcbusetemp}
 
 
 \begin{docTcbKey}{float}{\colOpt{=\meta{values}}}{default from \texttt{floatplacement}}
@@ -868,16 +1183,18 @@ with a listing.
   If they are not used, the placement uses the default values given by
  |floatplacement|.
 \begin{dispListing}
-\begin{tcolorbox}[float, title=Floating box from |float|]
+\begin{tcolorbox}[float, title=Floating box from |float|,
+    enhanced,watermark text={I'm also floating}]
   This box floats to a feasible place automatically. You do not have to
   use a numbering for this floating object.
 \end{tcolorbox}
 \end{dispListing}
-\tcbusetemp
 \end{docTcbKey}
+{\tcbusetemp}
 
 
 \subsection{Embedding into the Surroundings}
+\enlargethispage{5mm}
 \begin{docTcbKey}{before}{=\meta{macros}}{no default, initially \cs{par}\cs{pagebreak[0]}\cs{noindent}}
   Sets the \meta{macros} which are executed before the colored box.
   They are not used for floating boxes.
@@ -932,6 +1249,16 @@ This is a \textbf{tcolorbox}.
 \end{dispExample}
 \end{docTcbKey}
 
+
+\begin{docTcbKey}{enlarge top at break by}{=\meta{length}}{no default, initially \texttt{0mm}}
+  Enlarges the bounding box distance to the top of the box by \meta{length}
+  \emph{if} the box is \refKey{/tcb/breakable}.
+  In this case, it is applied to \emph{middle} and \emph{last} parts in a
+  break sequence.
+  \refKey{/tcb/enlarge top by} overwrites this key.
+\end{docTcbKey}
+
+
 \begin{docTcbKey}{enlarge bottom by}{=\meta{length}}{no default, initially |0mm|}
   Enlarges the bounding box distance to the bottom of the box by \meta{length}.
 \begin{dispExample}
@@ -946,6 +1273,15 @@ This is a \textbf{tcolorbox}.
 \end{dispExample}
 \end{docTcbKey}
 
+
+\begin{docTcbKey}{enlarge bottom at break by}{=\meta{length}}{no default, initially \texttt{0mm}}
+  Enlarges the bounding box distance to the bottom of the box by \meta{length}
+  \emph{if} the box is \refKey{/tcb/breakable}.
+  In this case, it is applied to \emph{first} and \emph{middle} parts in a
+  break sequence. \refKey{/tcb/enlarge bottom by} overwrites this key.
+\end{docTcbKey}
+
+
 \clearpage
 \begin{docTcbKey}{enlarge left by}{=\meta{length}}{no default, initially |0mm|}
   Enlarges the bounding box distance to the left side of the box by \meta{length}.
@@ -1021,6 +1357,33 @@ This is a \textbf{tcolorbox}.
 
 \clearpage
 
+
+\subsection{Text Characteristics}
+\begin{docTcbKey}{parbox}{\colOpt{=\meta{boolean value}}}{default |true|, initially |true|}
+  The text inside a |tcolorbox| is formatted using a \LaTeX\ |minipage|
+  if the box is unbreakable. If breakable, the box tries a mimicry of
+  a |minipage|. In a |minipage| or |parbox|, paragraphs are formatted slightly different
+  as the main text. If the key value is set to |false|, the normal main text
+  behavior is restored. In some situations, this has some unwanted side
+  effects. It is recommended to use this experimental setting only
+  where you really want to have this feature.
+\end{docTcbKey}
+
+\begin{dispListing}
+% \usepackage{lipsum}  % preamble
+\tcbset{width=(\linewidth-2mm)/2,before=,after=,arc=1mm,
+  colframe=blue!75!black,colback=white,fonttitle=\bfseries,fontupper=\small,
+  left=2mm,right=2mm,top=1mm,bottom=1mm,equal height group=parbox}
+
+\begin{tcolorbox}[parbox,adjusted title={parbox=true (normal)}]
+  \lipsum[1-2]
+\end{tcolorbox}\hfill%
+\begin{tcolorbox}[parbox=false,adjusted title={parbox=false}]
+  \lipsum[1-2]
+\end{tcolorbox}%
+\end{dispListing}
+{\tcbusetemp}
+
 \subsection{Files}
 \begin{docTcbKey}{tempfile}{=\meta{file name}}{no default, initially \cs{jobname.tcbtemp}}
   Sets \meta{file name} as name for the temporary file which is used inside
@@ -1106,12 +1469,12 @@ This also loads the package |listings| \cite{heinz:2007a}.
 \begin{docEnvironment}{tcblisting}{\marg{options}}
   Creates a colored box based on a \refEnv{tcolorbox}.
   Controlled by the given \meta{options}, the
-  environment content is typesetted normally and/or as a listing.
+  environment content is typeset normally and/or as a listing.
   Furthermore, the \meta{options} control appearance and functions of
   the |tcolorbox|.
   By default, the listing is interpreted as a \LaTeX\ listing.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black}
 This is a \LaTeX\ example which displays the text as source code
 and in compiled form.
 \end{tcblisting}
@@ -1149,7 +1512,7 @@ This \textbf{text} is written to a standardized file for later usage.
   from a file named by the key value of |listing file|. Apart from that,
   the function is equal to that of \refEnv{tcblisting}.
 \begin{dispExample}
-\tcbinputlisting{colback=red!5,colframe=red!75!black,text only}
+\tcbinputlisting{colback=red!5!white,colframe=red!75!black,text only}
 \tcbinputlisting{colback=green!5,colframe=green!75!black,listing only}
 \end{dispExample}
 \end{docCommand}
@@ -1193,7 +1556,7 @@ be used inside these macros.
   For \LaTeX\ listings, there is a predefined |listings| style named |tcblatex|
   which can be used.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!25,left=6mm,
+\begin{tcblisting}{colback=red!5!white,colframe=red!25,left=6mm,
 listing options={style=tcblatex,numbers=left,numberstyle=\tiny\color{red!75!black}}}
 This is a \LaTeX\ example which displays the text as source code
 and in compiled form. Additionally, we use line numbers here.
@@ -1207,7 +1570,7 @@ and in compiled form. Additionally, we use line numbers here.
   for the |listings| package, see \cite{heinz:2007a}.
   For \LaTeX, there is a predefined style named |tcblatex|.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,
 listing style=tcblatex}
 Here, we use the predefined style.
 \end{tcblisting}
@@ -1219,7 +1582,7 @@ Here, we use the predefined style.
   Typesets the environment content as listing in the upper part and
   as compiled text in the lower part.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,listing and text}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,listing and text}
 This is a \LaTeX\ example.
 \end{tcblisting}
 \end{dispExample}
@@ -1229,7 +1592,7 @@ This is a \LaTeX\ example.
   Typesets the environment content as compiled text in the upper part and
   as listing in the lower part.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,text and listing}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,text and listing}
 This is a \LaTeX\ example.
 \end{tcblisting}
 \end{dispExample}
@@ -1238,7 +1601,7 @@ This is a \LaTeX\ example.
 \begin{docTcbKey}{listing only}{}{no value}
   Typesets the environment content as listing.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,listing only}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,listing only}
 This is a \LaTeX\ example.
 \end{tcblisting}
 \end{dispExample}
@@ -1247,7 +1610,7 @@ This is a \LaTeX\ example.
 \begin{docTcbKey}{text only}{}{no value}
   Typesets the environment content as compiled text.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,text only}
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,text only}
 This is a \LaTeX\ example.
 \end{tcblisting}
 \end{dispExample}
@@ -1261,7 +1624,7 @@ This is a \LaTeX\ example.
   and \refKey{/tcb/comment and listing}.
 \begin{dispExample}
 \begin{tcblisting}{comment={This comment is really only a comment},
-  colback=red!5,colframe=red!75!black}
+  colback=red!5!white,colframe=red!75!black}
 This is a \textbf{tcolorbox}.
 \end{tcblisting}
 \end{dispExample}
@@ -1272,7 +1635,7 @@ This is a \textbf{tcolorbox}.
   Typesets the environment content as listing in the upper part and
   a given comment in the lower part.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,listing and comment,
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,listing and comment,
   comment={This is my comment. It may contain line breaks.\par
     It can even use the environment content
     \flqq\ignorespaces\tcbuselistingtext\unskip\frqq}}
@@ -1287,7 +1650,7 @@ This is a \LaTeX\ example.
   Typesets a given comment in the upper part and
   the environment content as listing in the lower part.
 \begin{dispExample}
-\begin{tcblisting}{colback=red!5,colframe=red!75!black,comment and listing,
+\begin{tcblisting}{colback=red!5!white,colframe=red!75!black,comment and listing,
 comment={This is my comment.}}
 This is a \LaTeX\ example.
 \end{tcblisting}
@@ -1455,12 +1818,12 @@ processing. The solution contents themselves are saved to a subdirectory named
 \item The solutions are loaded by |\inputsol|.
 \end{itemize}
 
-Inside the excercise text, there may be text parts which are needed as
+Inside the exercise text, there may be text parts which are needed as
 \LaTeX\ source code and as compiled text as well. These parts can be
 saved by \refEnv{tcbwritetemp} and used in compiled form by \refCom{tcbusetemp}
 or as source code by \refCom{tcbusetemplisting}.
 
-At first, we generate some new keys. Since exercises und solutions should
+At first, we generate some new keys. Since exercises and solutions should
 be numbered, we force to use a label \meta{marker} while using the style |texercise|.
 Automatically, the label |exe:|\meta{marker} is used to mark the exercise
 and the label |sol:|\meta{marker} is used to mark the solution.
@@ -1689,9 +2052,9 @@ the section number.
 
 \tcbset{
   defstyle/.style={fonttitle=\bfseries\upshape, fontupper=\slshape,
-              arc=0mm, colback=blue!5,colframe=blue!75!black},
+              arc=0mm, colback=blue!5!white,colframe=blue!75!black},
   theostyle/.style={fonttitle=\bfseries\upshape, fontupper=\slshape,
-               colback=red!10,colframe=red!75!black},
+               colback=red!10!white,colframe=red!75!black},
 }
 \end{dispListing}
 \tcbusetemp
@@ -1755,14 +2118,25 @@ referenced with the marker \texttt{cor:nullstellen}.\bigskip
 
 
 \begin{dispExample}
-\begin{Theorem}[boxrule=2mm]{Hinreichende Bedingung
-                             f\"{u}r Wendepunkte}{wendehinreichend}%
+\begin{Theorem}[boxrule=2mm,toptitle=-1.5mm,bottomtitle=-1.5mm]{%
+    Hinreichende Bedingung f\"{u}r Wendepunkte}{wendehinreichend}%
   $f$ sei eine auf einem Intervall $]a,b[$ dreimal stetig differenzierbare Funktion.
   Ist $f''(x_0)=0$ in $x_0\in]a,b[$ und $f'''(x_0)\ne 0$, so ist
   $(x_0,f(x_0))$ ein Wendepunkt von $f$.
 \end{Theorem}
 \end{dispExample}
 
+You need more attention for your theorems? Here, you are \ldots
+
+\begin{dispExample}
+% tcbuselibrary{skins}  % preamble
+\begin{Theorem}[enhanced,frame style={circular glow={fill=yellow}},
+    watermark color=red!35!white,
+    watermark text={Overacting\\Fundamental Theorem}]%
+  {Fundamental Theorem of Theorems}{fundamental}%
+  \lipsum[1-2]
+\end{Theorem}
+\end{dispExample}
 
 
 \clearpage
@@ -1982,7 +2356,6 @@ This is my \colOpt{text}.
 \end{docCommand}
 
 
-
 \subsection{Option Keys of the Library}
 
 \begin{docTcbKey}{docexample}{}{style, no value}
@@ -1999,7 +2372,6 @@ This is my \colOpt{text}.
   \refKey{/tcb/listing style} which is used for 'normal' listings.
 \end{docTcbKey}
 
-
 \begin{docTcbKey}{color definition}{=\meta{color}}{no default, initially |Definition|}
   Sets the highlight color used by macro and key definitions.
 \end{docTcbKey}
@@ -2129,13 +2501,49 @@ option from the core package has to be set.
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
 \end{tcolorbox}
-\begin{tcolorbox}[skin=beamer,adjusted title=My title]
+\begin{tcolorbox}[skin=beamer,beamer,adjusted title=My title]
   This is my content.
 \end{tcolorbox}
 \end{dispExample}
 \end{docTcbKey}
 
 
+\begin{marker}
+  On first read, you may skip the rest of this subsection and proceed to
+  Subsection \ref{subsec:addstyleoptions} on page \pageref{subsec:addstyleoptions}.
+  All following keys in this subsection are automatically set by the selected skin
+  and you may never have to temper with them.
+  Nevertheless, they can be used after a skin was selected to modify
+  this skin.
+\end{marker}
+
+
+\begin{docTcbKey}{skin first}{=\meta{name}}{style, no default, initially \texttt{standard}}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the skin for the \emph{first} part of the break sequence
+  is set to \meta{name}, see Subsection \ref{subsec:breaksequence} on page \pageref{subsec:breaksequence}.
+  Typically, this key is set by a \refKey{/tcb/skin}.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{skin middle}{=\meta{name}}{style, no default, initially \texttt{standard}}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the skin for the \emph{middle} parts (if any) of the break sequence
+  is set to \meta{name}, see Subsection \ref{subsec:breaksequence} on page \pageref{subsec:breaksequence}.
+  Typically, this key is set by a \refKey{/tcb/skin}.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{skin last}{=\meta{name}}{style, no default, initially \texttt{standard}}
+  If the box is set to be \refKey{/tcb/breakable} and \emph{is} broken actually,
+  then the skin for the \emph{last} part of the break sequence
+  is set to \meta{name}, see Subsection \ref{subsec:breaksequence} on page \pageref{subsec:breaksequence}.
+  Typically, this key is set by a \refKey{/tcb/skin}.
+\end{docTcbKey}
+
+
+
+
 \begin{docTcbKey}{graphical environment}{=\meta{name}}{no default, initially \texttt{pgfpicture}}
   Sets the graphical environment for the |tcolorbox| to \meta{name}.
   Feasible values are |pgfpicture| and |tikzpicture| or environments which
@@ -2143,23 +2551,27 @@ option from the core package has to be set.
   may seldom be used directly.
 \end{docTcbKey}
 
-The skin of a |tcolorbox| is drawn by up to three \emph{engines}.
+The skin of a |tcolorbox| is drawn by up to four \emph{engines}.
 Afterwards, the text content is drawn which is not part of a skin.
-The three steps are:
+The four steps are:
 \begin{enumerate}
 \item The \emph{frame} of the box.
 \item The \emph{interior} of the box. The interior of a box with title is
   drawn differently from a box without title.
 \item The \emph{segmentation} (line) of the box, if there is a lower part.
+\item The \emph{title area} of the box, if there is a title.
 \end{enumerate}
 
-Every engine for the up to three steps can be set to one of three types:
+Every engine for the up to four steps can be set to one of the following types:
 \begin{enumerate}
 \item |standard|: the original code from the core package.
 \item |path|: a |tikz| path which can be controlled by options.
+\item |pathfirst|: a |tikz| path which can be controlled by options.
+\item |pathmiddle|: a |tikz| path which can be controlled by options.
+\item |pathlast|: a |tikz| path which can be controlled by options.
 \item |freelance|: arbitrary user code.
 \end{enumerate}
-\clearpage
+%\clearpage
 
 \begin{docTcbKey}{frame engine}{=\meta{name}}{no default, initially \texttt{standard}}
   Sets the \emph{frame} drawing engine for a box to \meta{name}.
@@ -2168,6 +2580,9 @@ Every engine for the up to three steps can be set to one of three types:
   \begin{itemize}
   \item |standard|: the original code from the core package,
   \item |path|: a |tikz| path which is controlled by \refKey{/tcb/frame style},
+  \item |pathfirst|: a |tikz| path which is controlled by \refKey{/tcb/frame style},
+  \item |pathmiddle|: a |tikz| path which is controlled by \refKey{/tcb/frame style},
+  \item |pathlast|: a |tikz| path which is controlled by \refKey{/tcb/frame style},
   \item |freelance|: arbitrary user code which is given by \refKey{/tcb/frame code}.
   \end{itemize}
 \end{docTcbKey}
@@ -2179,6 +2594,9 @@ Every engine for the up to three steps can be set to one of three types:
   \begin{itemize}
   \item |standard|: the original code from the core package,
   \item |path|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathfirst|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathmiddle|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathlast|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
   \item |freelance|: arbitrary user code which is given by \refKey{/tcb/interior titled code}.
   \end{itemize}
 \end{docTcbKey}
@@ -2190,6 +2608,9 @@ Every engine for the up to three steps can be set to one of three types:
   \begin{itemize}
   \item |standard|: the original code from the core package,
   \item |path|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathfirst|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathmiddle|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
+  \item |pathlast|: a |tikz| path which is controlled by \refKey{/tcb/interior style},
   \item |freelance|: arbitrary user code which is given by \refKey{/tcb/interior code}.
   \end{itemize}
 \end{docTcbKey}
@@ -2205,9 +2626,23 @@ Every engine for the up to three steps can be set to one of three types:
   \end{itemize}
 \end{docTcbKey}
 
+\begin{docTcbKey}{title engine}{=\meta{name}}{no default, initially \texttt{standard}}
+  Sets the \emph{title area} drawing engine for a titled box to \meta{name}.
+  Typically, this key is set by a \refKey{/tcb/skin}.
+  Feasible values for \meta{name} are:
+  \begin{itemize}
+  \item |standard|: the original code from the core package,
+  \item |path|: a |tikz| path which is controlled by \refKey{/tcb/title style},
+  \item |pathfirst|: a |tikz| path which is controlled by \refKey{/tcb/title style},
+  \item |pathmiddle|: a |tikz| path which is controlled by \refKey{/tcb/title style},
+  \item |pathlast|: a |tikz| path which is controlled by \refKey{/tcb/title style},
+  \item |freelance|: arbitrary user code which is given by \refKey{/tcb/title code}.
+  \end{itemize}
+\end{docTcbKey}
+
 \begin{docTcbKey}{geometry nodes}{\colOpt{=\meta{boolean value}}}{default |true|, initially |false|}
-  If set to |true|, three |tikz| nodes are defined for a |tcolorbox|
-  which are named |frame|, |interior|, and |segmentation|. These nodes
+  If set to |true|, up to four |tikz| nodes are defined for a |tcolorbox|
+  which are named |frame|, |interior|, |segmentation|, and |title|. These nodes
   describe the boundaries of the equally named parts of a |tcolorbox|.
   They are used by all engines of type |path| and they may be used by engines
   of type |freelance|. Typically, this key is set by a \refKey{/tcb/skin}.
@@ -2224,51 +2659,540 @@ Every engine for the up to three steps can be set to one of three types:
   interior titled code={\path[draw=blue,fill=blue!25]
       (interior.south west) rectangle (interior.north east);},
   segmentation code={\path[draw=green,fill=green!25]
-      (segmentation.south west) rectangle (segmentation.north east);}]
+      (segmentation.south west) rectangle (segmentation.north east);},
+  title code={\path[draw=black,fill=brown!75!black]
+      (title.south west) rectangle (title.north east);}]
   The upper part.\tcblower The lower part.
 \end{tcolorbox}
 \end{dispExample}
 \end{docTcbKey}
 
 
-\subsection{Skin 'standard'}
+\clearpage
+\subsection{Style Option Keys}\label{subsec:addstyleoptions}
+The following style options are applicable for all skins which
+use engines of type |path|, |pathfirst|, |pathmiddle|, or |pathlast|.
+Especially, the skin \refSkin{enhanced} supports \emph{all} of them
+and \refSkin{standard} \emph{none}.
+
+\begin{docTcbKey}{frame style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
+  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
+  for drawing the \emph{frame} of the box.\\
+  This option is available if the \refKey{/tcb/frame engine} is set to
+  |path|, |pathfirst|, |pathmiddle|, or |pathlast|.
+  It is \emph{not} available for |standard| and it \emph{may} be
+  applicable for |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,
+  frame style={left color=red!75!black,right color=blue!75!black}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{interior style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
+  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
+  for drawing the \emph{interior} of the box. They are used for the titled
+  and for the untitled version as well.\\
+  This option is available if the \refKey{/tcb/interior titled engine}
+  or \refKey{/tcb/interior engine} is set to
+  |path|, |pathfirst|, |pathmiddle|, or |pathlast|.
+  It is \emph{not} available for |standard| and it \emph{may} be
+  applicable for |freelance|.
+\begin{dispExample}
+\tcbset{colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,
+  interior style={left color=red!20!white,right color=yellow!50!white}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\clearpage
+\begin{docTcbKey}{segmentation style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
+  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
+  for drawing the \emph{segmentation} line of the box.\\
+  This option is available if the \refKey{/tcb/segmentation engine}
+  is set to |path|.
+  It is \emph{not} available for |standard| and it \emph{may} be
+  applicable for |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,
+  segmentation style={double=white,draw=blue,double distance=1pt,solid}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{title style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
+  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
+  for drawing the \emph{title area} of the box.\\
+  This option is available if the \refKey{/tcb/title engine} is set to
+  |path|, |pathfirst|, |pathmiddle|, or |pathlast|.
+  It is \emph{not} available for |standard| and it \emph{may} be
+  applicable for |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,coltitle=blue!50!black,
+  fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,
+  title style={fill=blue!15!yellow}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\clearpage
+\subsection{Code Option Keys}\label{subsec:addcodeoptions}
+The following code options are applicable for all skins which
+use engines of type |freelance|.
+Especially, the skin \refSkin{freelance} supports \emph{all} of them,
+\refSkin{standard} and \refSkin{enhanced} \emph{none} of them.
+
+
+\begin{docTcbKey}{frame code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
+  The given \meta{graphical code} is used for drawing the \emph{frame} of the box.\\
+  This option is available only if the \refKey{/tcb/frame engine} is set to |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[freelance,frame code={
+  \foreach \n in {north east,north west,south east,south west}
+  {\path [fill=red!75!black] (interior.\n) circle (3mm); }; }]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{interior titled code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
+  The given \meta{graphical code} is used
+  for drawing the \emph{interior} of the box, if the box comes with a title.\\
+  This option is available only if the \refKey{/tcb/interior titled engine} is set to |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[freelance,title=My title,interior titled code={
+  \path[draw=red!5!white,line width=5mm,line cap=round]
+    ([xshift=3mm,yshift=-3mm]interior.north west)
+    --([xshift=-3mm,yshift=3mm]interior.south east)
+    ([xshift=3mm,yshift=3mm]interior.south west)
+    --([xshift=-3mm,yshift=-3mm]interior.north east);}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\clearpage
+\begin{docTcbKey}{interior code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
+  The given \meta{graphical code} is used
+  for drawing the \emph{interior} of the box, if the box is without a title.\\
+  This option is available only if the \refKey{/tcb/interior engine} is set to |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black}
+
+\begin{tcolorbox}[freelance,interior code={
+  \path[draw=red!5!white,line width=5mm,line cap=round]
+    ([xshift=3mm,yshift=-3mm]interior.north west)
+    --([xshift=-3mm,yshift=3mm]interior.south east)
+    ([xshift=3mm,yshift=3mm]interior.south west)
+    --([xshift=-3mm,yshift=-3mm]interior.north east);}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{segmentation code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
+  The given \meta{graphical code} is used for drawing the
+  \emph{segmentation} area of the box.\\
+  This option is available only if the \refKey{/tcb/segmentation engine} is set to |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[freelance,title=My title,segmentation code={
+  \path[top color=red!5!white,bottom color=red!5!white,middle color=blue]
+  (segmentation.south west) rectangle (segmentation.north east);}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\clearpage
+\begin{docTcbKey}{title code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
+  The given \meta{graphical code} is used for drawing the
+  \emph{title} area of the box.\\
+  This option is available only if the \refKey{/tcb/title engine} is set to |freelance|.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries,
+  coltitle=black}
+
+\begin{tcolorbox}[freelance,title=My title,title code={
+  \path[draw=yellow,solid,decorate,line width=2mm,
+    decoration={coil,aspect=0,segment length=10.1mm}]
+    ([xshift=1mm]title.west) -- ([xshift=-1mm]title.east);}]
+This is a \textbf{tcolorbox}.
+\tcblower
+This is the lower part.
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\clearpage
+\subsection{Watermark Option Keys}\label{subsec:watermarks}
+The following watermark options are applicable for all skins which
+use |tikzpicture| as \refKey{/tcb/graphical environment}.
+Therefore, the skin \refSkin{standard} does not support these watermarks,
+but all other skins, e.\,g.\ \refSkin{enhanced}.
+
+\begin{marker}
+The watermark options rely on the more general overlay options described in
+Section \ref{subsec:overlays} from page \pageref{subsec:overlays}.
+Therefore, \emph{watermarks} and \emph{overlays} cannot be used mixed.
+\end{marker}
+
+
+\begin{docTcbKey}{watermark text}{=\meta{text}}{no default, initially unset}
+  Writes some \meta{text} in the center of the interior region of a |tcolorbox|.
+  This \meta{text} is written \emph{after} the
+  frame and interior are drawn and \emph{before} the text content is drawn.
+  It is zoomed or stretched according the values of
+  \refKey{/tcb/watermark zoom} or \refKey{/tcb/watermark stretch}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,watermark text=My Watermark]
+\lipsum[1]
+\tcblower
+\lipsum[2]
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{watermark text on}{=\meta{part} is \meta{text}}{no default, initially unset}
+  This option writes some \meta{text} in the center of the interior region of a |tcolorbox|
+  as described for \refKey{/tcb/watermark text}.
+  But this is done only for boxes named \meta{part} of a break sequence, see
+  \refKey{/tcb/breakable}.\\ 
+  Feasible values for \meta{part} are:
+  \begin{itemize}
+  \item |broken|: all broken box parts,
+  \item |unbroken|: unbroken boxes only,
+  \item |first|: first parts of a break sequence,
+  \item |middle|: middle parts of a break sequence,
+  \item |last|: last parts of a break sequence,
+  \item |unbroken and first|: unbroken boxes and first parts of a break sequence,
+  \item |middle and last|: middle and last parts of a break sequence.
+  \end{itemize}
+\end{docTcbKey}
+
+
+\clearpage
+
+
+\begin{docTcbKey}{watermark graphics}{=\meta{file name}}{no default, initially unset}
+  Draws an external picture referenced by \meta{file name}
+  in the center of the interior region of a |tcolorbox|.
+  The picture is drawn \emph{after} the
+  frame and interior are drawn and \emph{before} the text content is drawn.
+  It is zoomed or stretched according the values of
+  \refKey{/tcb/watermark zoom} or \refKey{/tcb/watermark stretch}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,watermark graphics=Basilica_5.png,
+  watermark opacity=0.15]
+\lipsum[1-2]
+\tcblower
+This example uses a public domain picture from\\
+\url{http://commons.wikimedia.org/wiki/File:Basilica_5.png}
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{watermark graphics on}{=\meta{part} is \meta{file name}}{no default, initially unset}
+  This option draws a picture referenced by \meta{file name} in the center of the interior region of a |tcolorbox|
+  as described for \refKey{/tcb/watermark graphics}.
+  But this is done only for boxes named \meta{part} of a break sequence, see
+  \refKey{/tcb/breakable}.\\ 
+  Feasible values for \meta{part} are:
+  \begin{itemize}
+  \item |broken|: all broken box parts,
+  \item |unbroken|: unbroken boxes only,
+  \item |first|: first parts of a break sequence,
+  \item |middle|: middle parts of a break sequence,
+  \item |last|: last parts of a break sequence,
+  \item |unbroken and first|: unbroken boxes and first parts of a break sequence,
+  \item |middle and last|: middle and last parts of a break sequence.
+  \end{itemize}
+\end{docTcbKey}
+
+
+
+\clearpage
+\begin{docTcbKey}{watermark tikz}{=\meta{graphical code}}{no default, initially unset}
+  Draws the given |tikz| \meta{graphical code}
+  in the center of the interior region of a |tcolorbox|.
+  The code is executed \emph{after} the
+  frame and interior are drawn and \emph{before} the text content is drawn.
+  The result is zoomed or stretched according the values of
+  \refKey{/tcb/watermark zoom} or \refKey{/tcb/watermark stretch}.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,
+  watermark tikz={\draw[line width=2mm] (interior) circle (1cm)
+    node{\fontfamily{ptm}\fontseries{b}\fontsize{20mm}{20mm}\selectfont ?};}]
+\lipsum[1]
+\tcblower
+\lipsum[2]
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+
+\begin{docTcbKey}{watermark tikz on}{=\meta{part} is \meta{graphical code}}{no default, initially unset}
+  This option draws the given |tikz| \meta{graphical code} in the center of the interior region of a |tcolorbox|
+  as described for \refKey{/tcb/watermark tikz}.
+  But this is done only for boxes named \meta{part} of a break sequence, see
+  \refKey{/tcb/breakable}.\\ 
+  Feasible values for \meta{part} are:
+  \begin{itemize}
+  \item |broken|: all broken box parts,
+  \item |unbroken|: unbroken boxes only,
+  \item |first|: first parts of a break sequence,
+  \item |middle|: middle parts of a break sequence,
+  \item |last|: last parts of a break sequence,
+  \item |unbroken and first|: unbroken boxes and first parts of a break sequence,
+  \item |middle and last|: middle and last parts of a break sequence.
+  \end{itemize}
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{no watermark}{}{style, no default, initially set}
+  Removes the watermark if set before. This is an alias for
+  \refKey{/tcb/no overlay}.
+\end{docTcbKey}
+
+
+\clearpage
+\begin{docTcbKey}{watermark opacity}{=\meta{fraction}}{no default, initially |1.00|}
+  Sets the opacity value $\in[0,1]$ for a watermark.
+\begin{dispExample}
+\tcbset{enhanced,colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries,
+  watermark text=Watermark,before=,after=,width=(\linewidth-2mm)/2}
+
+\begin{tcolorbox}[title=Opacity 1.00,watermark opacity=1.00]
+\lipsum[2]
+\end{tcolorbox}\hfill%
+\begin{tcolorbox}[title=Opacity 0.50,watermark opacity=0.50]
+\lipsum[2]
+\end{tcolorbox}%
+\end{dispExample}
+\end{docTcbKey}
+
+\enlargethispage{5mm}
+\begin{docTcbKey}{watermark zoom}{=\meta{fraction}}{no default, initially |0.75|}
+  Sets the zoom value for a watermark. The zoom respects the aspect ratio.
+  The value $1.0$ means to fill the whole box.
+\begin{dispExample}
+\tcbset{enhanced,colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries,
+  watermark text=Watermark,before=,after=,width=(\linewidth-2mm)/2}
+
+\begin{tcolorbox}[title=Zoom 1.00,watermark zoom=1.00]
+\lipsum[2]
+\end{tcolorbox}\hfill%
+\begin{tcolorbox}[title=Zoom 0.50,watermark zoom=0.50]
+\lipsum[2]
+\end{tcolorbox}%
+\end{dispExample}
+\end{docTcbKey}
+
+\clearpage
+
+\begin{docTcbKey}{watermark stretch}{=\meta{fraction}}{no default, initially unset}
+  Sets the stretch value for a watermark. The stretch value is applied to width
+  and height in relation to the box dimensions. It does not respect the aspect ratio.
+  The value $1.0$ means to fill the whole box.
+\begin{dispExample}
+\tcbset{enhanced,colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries,
+  watermark graphics=Basilica_5.png,watermark opacity=0.15,
+  before=,after=,width=(\linewidth-2mm)/2}
+
+\begin{tcolorbox}[title=Stretch 1.00,watermark stretch=1.00]
+\lipsum[2]
+\end{tcolorbox}\hfill%
+\begin{tcolorbox}[title=Stretch 0.50,watermark stretch=0.50]
+\lipsum[2]
+\end{tcolorbox}%
+\end{dispExample}
+\end{docTcbKey}
+
+\begin{docTcbKey}{watermark color}{=\meta{color}}{no default, initially mixed background and frame color}
+  Sets the color for the watermark.
+\begin{dispExample}
+\tcbset{colback=red!5!white,colframe=red!75!black,fonttitle=\bfseries}
+
+\begin{tcolorbox}[enhanced,title=My title,watermark text=My Watermark,
+  watermark color=yellow!50!red]
+\lipsum[1]
+\end{tcolorbox}
+\end{dispExample}
+\end{docTcbKey}
+
+
+
+\clearpage
+\tcbset{skintable/.style={colframe=red!50!yellow!50!black,
+  colback=red!50!yellow!5!white,coltitle=red!50!yellow!3!white,
+  fonttitle=\bfseries,before=\par\smallskip,
+  title=Environment and engines for the skin '\texttt{#1}'}}
+
+\subsection{Skin 'standard'}\label{subsec:skinstandard}
+\begin{marker}Note that the option keys \refKey{/tcb/frame style},
+  \refKey{/tcb/interior style},
+  \refKey{/tcb/segmentation style}, and
+  \refKey{/tcb/title style} are not be applicable to the standard skin.
+  Also, watermarks (see Subsection \ref{subsec:watermarks})
+  are not usable with the standard skin.
+\end{marker}
+
 \begin{docSkin}{standard}
   This is the standard skin from the core package. All drawing engines
   are set to type |standard|. The drawing is based on |pgf| commands and
   does not need the |tikz| package.
+\begin{tcolorbox}[skintable=standard]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |pgfpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |standard|\\
+    \refKey{/tcb/interior titled engine}: \> |standard|\\ 
+    \refKey{/tcb/interior engine}:        \> |standard|\\
+    \refKey{/tcb/segmentation engine}:    \> |standard|\\
+    \refKey{/tcb/title engine}:           \> |standard|
+  \end{tabbing}
+\end{tcolorbox}
 \end{docSkin}
 
+\begin{docTcbKey}{standard}{}{style, no value}
+  This is an abbreviation for setting |skin=standard|.
+\end{docTcbKey}
+
+\begin{dispExample}
+\tcbset{standard,equal height group=standard,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\subsection{Skin family 'enhanced'}
+\begin{marker}
+If you like the standard appearance of a |tcolorbox| but you want to
+have some 'enhanced' features, the |enhanced| skin is what you are looking for.
+\end{marker}
 
-\subsection{Skin 'enhanced'}
 \begin{docSkin}{enhanced}
   This skin translates the drawing commands of the core package into |tikz|
   path commands. Therefore, it allows all |tikz| high level options for
   these paths and has more flexibility compared to the \refSkin{standard} skin.
   You pay for this with some prolonged compilation time.
-  All drawing engines are set to type |path|; they use the |tikz| package
-  and compute the \refKey{/tcb/geometry nodes}.
   The |tikz| path options can
-  be given with the following option keys.
+  be given with the option keys
+  \refKey{/tcb/frame style},
+  \refKey{/tcb/interior style},
+  \refKey{/tcb/segmentation style}, and
+  \refKey{/tcb/title style}.
+\begin{tcolorbox}[skintable=enhanced]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |path|\\
+    \refKey{/tcb/interior titled engine}: \> |path|\\ 
+    \refKey{/tcb/interior engine}:        \> |path|\\
+    \refKey{/tcb/segmentation engine}:    \> |path|\\
+    \refKey{/tcb/title engine}:           \> |path|
+  \end{tabbing}
+\end{tcolorbox}
 \end{docSkin}
 
-\begin{docTcbKey}{frame style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
-  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
-  for drawing the \emph{frame} of the box.
-\end{docTcbKey}
 
-\begin{docTcbKey}{interior style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
-  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
-  for drawing the \emph{interior} of the box. They are used for the titled
-  and for the untitled version as well.
+\begin{docTcbKey}{enhanced}{}{style, no value}
+  This is an abbreviation for setting |skin=enhanced|.
 \end{docTcbKey}
 
-\begin{docTcbKey}{segmentation style}{=\meta{\texttt{\upshape tikz} keys}}{style, no default}
-  The \meta{\texttt{\upshape tikz} keys} are used inside the |tikz| path command
-  for drawing the \emph{segmentation} line of the box.
-\end{docTcbKey}
+\begin{dispExample}
+\tcbset{enhanced,equal height group=enhanced,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
 
 \begin{dispExample}
-% needs shadings library
+% \usetikzlibrary{shadings}         % preamble
 \tcbset{skin=enhanced,fonttitle=\bfseries,
   frame style={upper left=blue,upper right=red,lower left=yellow,lower right=green},
   interior style={white,opacity=0.5},
@@ -2283,7 +3207,8 @@ Every engine for the up to three steps can be set to one of three types:
 
 
 \begin{dispExample}
-% needs shadows and decorations.pathmorphing library
+% \usetikzlibrary{shadows}                  % preamble
+% \usetikzlibrary{decorations.pathmorphing} % preamble
 \tcbset{skin=enhanced,fonttitle=\bfseries,boxrule=1mm,
   frame style={draw=FireBrick,fill=Salmon,drop shadow},
   interior style={draw=FireBrick,top color=Salmon!10,bottom color=Salmon!20},
@@ -2300,6 +3225,153 @@ Of course, skins can be used for listings also.
 
 
 \clearpage
+\begin{docSkin}{enhancedfirst}
+This is a flavor of \refSkin{enhanced} which is used as a \emph{first} part
+in a break sequence for \refSkin{enhanced}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=enhancedfirst]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathfirst|\\
+    \refKey{/tcb/interior titled engine}: \> |pathfirst|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathfirst|\\
+    \refKey{/tcb/segmentation engine}:    \> |path|\\
+    \refKey{/tcb/title engine}:           \> |pathfirst|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{skin=enhancedfirst,equal height group=enhancedfirst,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+
+\clearpage
+\begin{docSkin}{enhancedmiddle}
+This is a flavor of \refSkin{enhanced} which is used as a \emph{middle} part
+in a break sequence for \refSkin{enhanced}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=enhancedmiddle]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathmiddle|\\
+    \refKey{/tcb/interior titled engine}: \> |pathmiddle|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathmiddle|\\
+    \refKey{/tcb/segmentation engine}:    \> |path|\\
+    \refKey{/tcb/title engine}:           \> |pathmiddle|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{skin=enhancedmiddle,equal height group=enhancedmiddle,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\begin{docTcbKey}{marker}{}{style, no value}
+  This styles relies on the skin \refSkin{enhancedmiddle}. It is
+  intended to be used as an optical marker like a highlighter pen.
+\begin{dispExample}
+\begin{marker}
+\lipsum[2]
+\end{marker}
+\end{dispExample}
+\end{docTcbKey}
+
+
+
+
+\clearpage
+\begin{docSkin}{enhancedlast}
+This is a flavor of \refSkin{enhanced} which is used as a \emph{last} part
+in a break sequence for \refSkin{enhanced}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=enhancedlast]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathlast|\\
+    \refKey{/tcb/interior titled engine}: \> |pathlast|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathlast|\\
+    \refKey{/tcb/segmentation engine}:    \> |path|\\
+    \refKey{/tcb/title engine}:           \> |pathlast|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+\begin{dispExample}
+\tcbset{skin=enhancedlast,equal height group=enhancedlast,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+
+
+\clearpage
 \subsection{Skin 'freelance'}
 \begin{docSkin}{freelance}
   This skin gives full freedom for the appearance of the |tcolorbox|.
@@ -2310,29 +3382,48 @@ Of course, skins can be used for listings also.
   The drawing code can be given
   with the following option keys. As default value, the code from the |standard|
   skin is set.
+\begin{tcolorbox}[skintable=freelance]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |freelance|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |freelance|
+  \end{tabbing}
+\end{tcolorbox}
 \end{docSkin}
 
-
-\begin{docTcbKey}{frame code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
-  The given \meta{graphical code} is used for drawing the \emph{frame} of the box.
-\end{docTcbKey}
-
-\begin{docTcbKey}{interior titled code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
-  The given \meta{graphical code} is used
-  for drawing the \emph{interior} of the box, if the box comes with a title.
-\end{docTcbKey}
-
-\begin{docTcbKey}{interior code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
-  The given \meta{graphical code} is used
-  for drawing the \emph{interior} of the box, if the box is without a title.
-\end{docTcbKey}
-
-\begin{docTcbKey}{segmentation code}{\colOpt{=\meta{graphical code}}}{code, default from |standard|}
-  The given \meta{graphical code} is used for drawing the
-  \emph{segmentation} area of the box.
+\begin{docTcbKey}{freelance}{}{style, no value}
+  This is an abbreviation for setting |skin=freelance|.
 \end{docTcbKey}
 
+\begin{dispExample}
+\tcbset{freelance,equal height group=freelance,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
 
+\clearpage
 \begin{dispExample}
   \tcbset{skin=freelance,boxrule=2mm,enlarge top by=2mm,enlarge bottom by=2mm,
     enlarge left by=3mm,enlarge right by=3mm,width=\linewidth-6mm,
@@ -2356,11 +3447,22 @@ Of course, skins can be used for listings also.
 \end{dispExample}
 
 \clearpage
-\subsection{Skin 'bicolor'}
+\subsection{Skin family 'bicolor'}
 \begin{docSkin}{bicolor}
   This skin is quite similar to the \refSkin{standard} and \refSkin{enhanced} skin.
   But instead of a segmentation line, the optional lower part of the box is filled with a
   different color or drawn with a different style.
+\begin{tcolorbox}[skintable=bicolor]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |path|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |path|
+  \end{tabbing}
+\end{tcolorbox}
   \begin{itemize}
   \item The most basic usage of this skin is to set the background color of
     the lower part by \refKey{/tcb/colbacklower} and all other options like for
@@ -2391,30 +3493,28 @@ Of course, skins can be used for listings also.
   \end{itemize}
 \end{docSkin}
 
-
-\begin{docTcbKey}{colbacklower}{=\meta{color}}{no default, initially \texttt{black!15!white}}
-  Sets the background \meta{color} of the lower part. It depends on the skin,
-  if this value is used.
+\begin{docTcbKey}{bicolor}{}{style, no value}
+  This is an abbreviation for setting |skin=bicolor|.
 \end{docTcbKey}
 
 
 \begin{dispExample}
-\tcbset{skin=bicolor,colback=LightGreen,colframe=DarkGreen,
-  colbacklower=LimeGreen!75!LightGreen,
-  width=(\linewidth-8mm)/4,before=,after=\hfill,equal height group=bicolg,
+\tcbset{bicolor,equal height group=bicolor,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
   left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
-
+%
 \begin{tcolorbox}
   This is my content.
-\end{tcolorbox}
+\end{tcolorbox}\hfill
 \begin{tcolorbox}
   This is my content.
   \tcblower
   More content.
-\end{tcolorbox}
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
-\end{tcolorbox}
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
   \tcblower
@@ -2422,6 +3522,10 @@ Of course, skins can be used for listings also.
 \end{tcolorbox}
 \end{dispExample}
 
+\begin{docTcbKey}{colbacklower}{=\meta{color}}{no default, initially \texttt{black!15!white}}
+  Sets the background \meta{color} of the lower part. It depends on the skin,
+  if this value is used.
+\end{docTcbKey}
 
 \begin{dispExample}
 \tcbset{gitexample/.style={listing and comment,comment={#1},
@@ -2445,7 +3549,142 @@ git commit -am 'changes to my example'
 
 
 \clearpage
-\subsection{Skin 'beamer'}
+
+
+\begin{docSkin}{bicolorfirst}
+This is a flavor of \refSkin{bicolor} which is used as a \emph{first} part
+in a break sequence for \refSkin{bicolor}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=bicolorfirst]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathfirst|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathfirst|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+\begin{dispExample}
+\tcbset{skin=bicolorfirst,equal height group=bicolorfirst,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\begin{docSkin}{bicolormiddle}
+This is a flavor of \refSkin{bicolor} which is used as a \emph{middle} part
+in a break sequence for \refSkin{bicolor}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=bicolormiddle]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathmiddle|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathmiddle|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{skin=bicolormiddle,equal height group=bicolormiddle,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\begin{docSkin}{bicolorlast}
+This is a flavor of \refSkin{bicolor} which is used as a \emph{last} part
+in a break sequence for \refSkin{bicolor}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=bicolorlast]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathlast|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathlast|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{skin=bicolorlast,equal height group=bicolorlast,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+
+\clearpage
+\subsection{Skin family 'beamer'}
+
 \begin{docSkin}{beamer}
   This skin resembles boxes known from the |beamer| class and therefore is
   called 'beamer'. It uses the normal colors from the core package but shades
@@ -2457,31 +3696,187 @@ git commit -am 'changes to my example'
 The appearance of the skin can be controlled by \refKey{/tcb/frame style}
 and \refKey{/tcb/interior style}, if needed. Here, the \emph{segmentation}
 cannot be controlled by a style.
+\begin{tcolorbox}[skintable=beamer]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |path|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |path|
+  \end{tabbing}
+\end{tcolorbox}
 \end{docSkin}
 
+
+
+\begin{docTcbKey}{beamer}{}{style, no value}
+  This is an abbreviation for setting |skin=beamer|.
+  \begin{marker}It also changes the geometry and some style options.\end{marker}
+\end{docTcbKey}
+
+
+
 \begin{dispExample}
-\begin{tcolorbox}[skin=beamer,colback=Salmon!50!white,colframe=FireBrick!75!black,
+\tcbset{beamer,equal height group=beamer,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+
+\begin{dispExample}
+\begin{tcolorbox}[beamer,colback=Salmon!50!white,colframe=FireBrick!75!black,
   adjusted title=A colored box with the 'beamer' skin]
 This box looks like a box provided by the \texttt{beamer} class.
 \end{tcolorbox}
 \end{dispExample}
 
+
+
+
+\begin{docSkin}{beamerfirst}
+This is a flavor of \refSkin{beamer} which is used as a \emph{first} part
+in a break sequence for \refSkin{beamer}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=beamerfirst]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathfirst|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathfirst|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
 \begin{dispExample}
-\tcbset{skin=beamer,colback=LightGreen,colframe=DarkGreen,
-  width=(\linewidth-8mm)/4,before=,after=\hfill,equal height group=beamg,
+\tcbset{beamer,skin=beamerfirst,equal height group=beamerfirst,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
   left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
-
+%
 \begin{tcolorbox}
   This is my content.
-\end{tcolorbox}
+\end{tcolorbox}\hfill
 \begin{tcolorbox}
   This is my content.
   \tcblower
   More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+
+\begin{docSkin}{beamermiddle}
+This is a flavor of \refSkin{beamer} which is used as a \emph{middle} part
+in a break sequence for \refSkin{beamer}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=beamermiddle]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathmiddle|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathmiddle|
+  \end{tabbing}
 \end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{beamer,skin=beamermiddle,equal height group=beamermiddle,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\begin{docSkin}{beamerlast}
+This is a flavor of \refSkin{beamer} which is used as a \emph{last} part
+in a break sequence for \refSkin{beamer}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=beamerlast]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathlast|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |pathlast|
+  \end{tabbing}
 \end{tcolorbox}
+\end{docSkin}
+
+\begin{dispExample}
+\tcbset{beamer,skin=beamerlast,equal height group=beamerlast,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
   \tcblower
@@ -2490,8 +3885,9 @@ This box looks like a box provided by the \texttt{beamer} class.
 \end{dispExample}
 
 
+
 \clearpage
-\subsection{Skin 'widget'}
+\subsection{Skin family 'widget'}
 \begin{docSkin}{widget}
   This skin uses the normal colors from the core package but shades
   them a little bit. To use this skin, the |tikz| library |shadings|
@@ -2502,31 +3898,232 @@ This box looks like a box provided by the \texttt{beamer} class.
 The appearance of the skin can be controlled by \refKey{/tcb/frame style},
 \refKey{/tcb/interior style}, and \refKey{/tcb/segmentation style},
 if needed.
+\begin{tcolorbox}[skintable=widget]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |path|\\
+    \refKey{/tcb/interior titled engine}: \> |path|\\ 
+    \refKey{/tcb/interior engine}:        \> |path|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |freelance|
+  \end{tabbing}
+\end{tcolorbox}
 \end{docSkin}
 
+
+\begin{docTcbKey}{widget}{}{style, no value}
+  This is an abbreviation for setting |skin=widget|.
+  \begin{marker}It also changes the geometry and some style options.\end{marker}
+\end{docTcbKey}
+
+
 \begin{dispExample}
-\begin{tcolorbox}[skin=widget,colback=Salmon!50!white,colframe=FireBrick!75!black,
+\tcbset{widget,equal height group=widget,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\begin{dispExample}
+\begin{tcolorbox}[widget,colback=Salmon!50!white,colframe=FireBrick!75!black,
   adjusted title=A colored box with the 'widget' skin]
 This is my content.
 \end{tcolorbox}
 \end{dispExample}
 
+
+
+\begin{docSkin}{widgetfirst}
+This is a flavor of \refSkin{widget} which is used as a \emph{first} part
+in a break sequence for \refSkin{widget}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=widgetfirst]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathfirst|\\
+    \refKey{/tcb/interior titled engine}: \> |pathfirst|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathfirst|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |freelance|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
 \begin{dispExample}
-\tcbset{skin=widget,colback=LightGreen,colframe=DarkGreen,
-  width=(\linewidth-8mm)/4,before=,after=\hfill,equal height group=widg,
+\tcbset{widget,skin=widgetfirst,equal height group=widgetfirst,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
   left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
-
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}
   This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
 \end{tcolorbox}
+\end{dispExample}
+
+\clearpage
+
+\begin{docSkin}{widgetmiddle}
+This is a flavor of \refSkin{widget} which is used as a \emph{middle} part
+in a break sequence for \refSkin{widget}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=widgetmiddle]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathmiddle|\\
+    \refKey{/tcb/interior titled engine}: \> |pathmiddle|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathmiddle|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |freelance|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+\begin{dispExample}
+\tcbset{widget,skin=widgetmiddle,equal height group=widgetmiddle,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}
   This is my content.
   \tcblower
   More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+  \tcblower
+  More content.
 \end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\begin{docSkin}{widgetlast}
+This is a flavor of \refSkin{widget} which is used as a \emph{last} part
+in a break sequence for \refSkin{widget}.
+Nevertheless, this skin can be applied independently.
+\begin{tcolorbox}[skintable=widgetlast]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |pathlast|\\
+    \refKey{/tcb/interior titled engine}: \> |pathlast|\\ 
+    \refKey{/tcb/interior engine}:        \> |pathlast|\\
+    \refKey{/tcb/segmentation engine}:    \> |freelance|\\
+    \refKey{/tcb/title engine}:           \> |freelance|
+  \end{tabbing}
+\end{tcolorbox}
+\end{docSkin}
+
+
+\begin{dispExample}
+\tcbset{widget,skin=widgetlast,equal height group=widgetlast,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+
+\subsection{Skin 'draft'}\label{subsec:draft}
+
+\begin{docSkin}{draft}
+  This skin is intended to be used while drafting new geometric settings
+  for a |tcolorbox|.
+\begin{tcolorbox}[skintable=draft]
+  \begin{tabbing}
+    \refKey{/tcb/interior titled engine}: \=\kill
+    \refKey{/tcb/graphical environment}:  \> |tikzpicture|\\ 
+    \refKey{/tcb/frame engine}:           \> |freelance|\\
+    \refKey{/tcb/interior titled engine}: \> |freelance|\\ 
+    \refKey{/tcb/interior engine}:        \> |freelance|\\
+    \refKey{/tcb/segmentation engine}:    \> |path|\\
+    \refKey{/tcb/title engine}:           \> |path|
+  \end{tabbing}
 \end{tcolorbox}
+\end{docSkin}
+
+\begin{docTcbKey}{draft}{}{style, no value}
+  This is an abbreviation for setting |skin=draft|.
+\end{docTcbKey}
+
+
+\begin{dispExample}
+\tcbset{draft,equal height group=draft,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/4,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}
+  This is my content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}
+  This is my content.
+  \tcblower
+  More content.
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[adjusted title=My title]
+  This is my content.
+\end{tcolorbox}\hfill
 \begin{tcolorbox}[adjusted title=My title]
   This is my content.
   \tcblower
@@ -2535,6 +4132,256 @@ This is my content.
 \end{dispExample}
 
 
+\begin{dispExample}
+\vspace*{3mm}
+\begin{tcolorbox}[draft,title=A colored box with the 'draft' skin]
+\lipsum[1-3]
+\tcblower
+\lipsum[4-6]
+\end{tcolorbox}
+\end{dispExample}
+
+
+\clearpage
+\section{Library 'breakable'}\label{sec:breakable}
+The library is loaded by a package option or inside the preamble by:
+\begin{dispListing}
+\tcbuselibrary{breakable}
+\end{dispListing}
+
+\subsection{Technical Overview}
+The library 'breakable' supports the automatic breaking of a |tcolorbox|.
+This feature is enabled by \refKey{/tcb/breakable}
+and disabled by \refKey{/tcb/unbreakable}.
+
+{
+\tcbset{colframe=Navy,colback=AliceBlue,fonttitle=\bfseries,
+  watermark color=AliceBlue!85!Navy,enhanced}
+If a |tcolorbox| is set to be \refKey{/tcb/breakable}, then the following
+algorithm is executed:
+\begin{enumerate}
+\item The box content is read to a box register similar but not identical
+  to the unbreakable case.
+\item If the total box fits into the current page, it is shipped out visibly
+  unbroken and the algorithm stops.
+  \begin{tcolorbox}[title=Unbroken Box,watermark text=unbroken]
+  The box.
+  \end{tcolorbox}
+\item Otherwise, it is checked if at least \refKey{/tcb/lines before break}
+  of the upper box can be placed on the current page.
+  If not, a page break is inserted and the algorithm goes back to Step 2.
+\item Now, the \emph{break sequence} starts.
+  The upper box part or the lower box part is split such that it fits
+  into the current page. The fitting part is named \emph{first part} of
+  the \emph{break sequence} and shipped out.
+  \begin{tcolorbox}[title=Broken Box,watermark text=first,skin=enhancedfirst]
+  The box.
+  \end{tcolorbox}
+\item
+  If the remaining content of the total box
+  fits into the current page, the algorithm continues with Step 7, else
+  with Step 6.
+\item
+  The upper box part or the lower box part is split such that it fits
+  into the current page. The fitting part is named \emph{middle part} of
+  the \emph{break sequence} and shipped out.
+  Then, the algorithm goes back to Step 5.
+  \begin{tcolorbox}[watermark text=middle,skin=enhancedmiddle]
+  The box.
+  \end{tcolorbox}
+\item
+  The remaining part is named \emph{last part} of
+  the \emph{break sequence} and shipped out. The algorithm stops.
+  \begin{tcolorbox}[watermark text=last,skin=enhancedlast]
+  The box.
+  \end{tcolorbox}
+\end{enumerate}
+}
+
+The algorithm takes care that the optional segmentation line never appears at
+the end of a box. The optional lower box part is also checked to
+have at least \refKey{/tcb/lines before break}.
+
+\clearpage
+In principal, all boxes of the \emph{break sequence} share the same geometric
+parameters. The differences are:
+\begin{itemize}
+\item The given \refKey{/tcb/before} and \refKey{/tcb/after} values are
+  used only before the \emph{first} and after the \emph{last} part
+  of the \emph{break sequence}.
+\item A special behavior between the parts of the \emph{break sequence} can
+  be given by \refKey{/tcb/toprule at break},
+  \refKey{/tcb/bottomrule at break},
+  \refKey{/tcb/enlarge top at break by}, and
+  \refKey{/tcb/enlarge bottom at break by}.
+\item The \refKey{/tcb/skin} decides \emph{how} the \emph{first}, \emph{middle},
+  and \emph{last} part look like. Actually, every part type has its own
+  skin given by the options  \refKey{/tcb/skin first}, \refKey{/tcb/skin middle}, and
+  \refKey{/tcb/skin last}. Typically, these options are set automatically by
+  the main skin, see Subsection \ref{subsec:breaksequence} from
+  page \pageref{subsec:breaksequence}.
+\end{itemize}
+
+
+\subsection{Limitations and Known Bugs}
+\begin{itemize}
+\item The box content is a \TeX\ |\vbox| register which has a
+  restricted capacity. Therefore, you cannot place hundreds of pages
+  inside a |tcolorbox|.
+\item Footnotes can be used inside an \refKey{/tcb/unbreakable} box
+  but not inside a \refKey{/tcb/breakable} box, even if it is not broken
+  actually. Other different behaviors may and will be effective.
+\item You can nest an unbreakable |tcolorbox| inside another |tcolorbox|,
+  even inside a breakable one. But you should not nest a breakable box
+  inside a breakable box since this will give a mess. Inside a breakable box,
+  the further breaking is disabled by default. If you really want to or
+  have to use the keys \refKey{/tcb/breakable} or \refKey{/tcb/unbreakable}
+  inside the content of an outer |tcolorbox|, you have to guard this with a
+  \TeX\ group.
+\item If your text content contains some text color changing commands,
+  your color will not survive the break to the next box\footnote{The reason is that
+  I am to dumb to catch the current color at the split point. If you know the trick,
+  let me know.}.
+\end{itemize}
+
+
+\clearpage
+\subsection{Option Keys}
+\begin{docTcbKey}{breakable}{}{no value}
+  Allows the |tcolorbox| to be breakable. If the box is larger than the
+  available space at the current page, the box is automatically broken
+  and continued to the next next page. All sorts of |tcolorbox| can be made
+  breakable. It depends on the skin how the breaking looks like.
+  If you do not know better, use \refKey{/tcb/enhanced} for breaking a box.
+  The parts of the \emph{break sequence} are numbered
+  by the counter |tcbbreakpart|.
+  \begin{dispListing}
+  % \usepackage{lipsum}  % preamble
+  \tcbset{colback=red!5!white,colframe=red!75!black,
+    watermark color=yellow!25!white,watermark text=\arabic{tcbbreakpart},
+    fonttitle=\bfseries}
+
+  \begin{tcolorbox}[breakable,enhanced,title=My breakable box]
+  \lipsum[1-6]
+  \end{tcolorbox}
+  \end{dispListing}
+\end{docTcbKey}
+{\tcbusetemp}
+
+
+\begin{docTcbKey}{unbreakable}{}{no value, initially set}
+  Sets the |tcolorbox| to be unbreakable.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{title after break}{=\meta{text}}{no default, initially empty}
+  The \refKey{/tcb/title} is used only for the \emph{first} part of a
+  \emph{break sequence}. Use |title after break| to create a heading line
+  with \meta{text} as content for all following parts.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{notitle after break}{}{no value, initially set}
+  Removes the title line or following parts in a  \emph{break sequence} if set before.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{adjusted title after break}{=\meta{text}}{style, no default, initially unset}
+  Works like \refKey{/tcb/adjusted title} but applied to \refKey{/tcb/title after break}.
+\end{docTcbKey}
+
+
+\begin{docTcbKey}{lines before break}{=\meta{number}}{no default, initially |2|}
+  Assures that the given \meta{number} of lines of the upper box part or
+  the lower box part are placed before a break happens.
+\end{docTcbKey}
+
+
+
+\begin{docTcbKey}{shrink break goal}{=\meta{length}}{no default, initially |0pt|}
+  This is an emergency parameter if the break algorithm produces unpleasant
+  breaks. It shrinks the goal height of the current box part by \meta{length}
+  which may result in smaller boxes. Never use negative values.
+\end{docTcbKey}
+
+
+
+
+\clearpage
+\subsection{Break Sequence for the Skins}\label{subsec:breaksequence}
+The following diagrams document the \emph{break sequence} for different
+skins. Depending on the main skin of a |tcolorbox|, the actual skins of
+the \emph{break sequence} parts are displayed.
+
+\def\tcbbreakskininto#1#2#3#4#5{%
+\begin{center}\begin{tikzpicture}
+\tcbset{width=5cm,colframe=Navy,colback=AliceBlue,fonttitle=\bfseries,
+  watermark color=AliceBlue!85!Navy,#5
+  }
+\node[above] (unbroken) at (0,0) {\begin{tcolorbox}[title=Unbroken Box,skin=#1,watermark text=unbroken,height=3.8cm]
+\texttt{skin=#1}
+\end{tcolorbox}};
+\node[above] (first) at (8,2.4) {\begin{tcolorbox}[title=Broken Boxes,skin=#2,watermark text=first,height=1.4cm]
+\texttt{skin=#2}
+\end{tcolorbox}};
+\node[above] (middle) at (8,1.2) {\begin{tcolorbox}[skin=#3,watermark text=middle,height=1cm]
+\texttt{skin=#3}
+\end{tcolorbox}};
+\node[above] (last) at (8,0) {\begin{tcolorbox}[skin=#4,watermark text=last,height=1cm]
+\texttt{skin=#4}
+\end{tcolorbox}};
+\path[draw=FireBrick,line width=2pt,->] (unbroken) edge (first.west) edge (middle.west) edge (last.west);
+\end{tikzpicture}\end{center}}
+
+\tcbbreakskininto{standard}{standard}{standard}{standard}{watermark text/.style={}}
+\tcbbreakskininto{enhanced}{enhancedfirst}{enhancedmiddle}{enhancedlast}{}
+\tcbbreakskininto{enhancedfirst}{enhancedfirst}{enhancedmiddle}{enhancedmiddle}{}
+\tcbbreakskininto{enhancedmiddle}{enhancedmiddle}{enhancedmiddle}{enhancedmiddle}{}
+\tcbbreakskininto{enhancedlast}{enhancedmiddle}{enhancedmiddle}{enhancedlast}{}
+\tcbbreakskininto{freelance}{freelance}{freelance}{freelance}{}
+\tcbbreakskininto{bicolor}{bicolorfirst}{bicolormiddle}{bicolorlast}{bicolor}
+\tcbbreakskininto{bicolorfirst}{bicolorfirst}{bicolormiddle}{bicolormiddle}{bicolor}
+\tcbbreakskininto{bicolormiddle}{bicolormiddle}{bicolormiddle}{bicolormiddle}{bicolor}
+\tcbbreakskininto{bicolorlast}{bicolormiddle}{bicolormiddle}{bicolorlast}{bicolor}
+\tcbbreakskininto{beamer}{beamerfirst}{beamermiddle}{beamerlast}{beamer}
+\tcbbreakskininto{beamerfirst}{beamerfirst}{beamermiddle}{beamermiddle}{beamer}
+\tcbbreakskininto{beamermiddle}{beamermiddle}{beamermiddle}{beamermiddle}{beamer}
+\tcbbreakskininto{beamerlast}{beamermiddle}{beamermiddle}{beamerlast}{beamer}
+\clearpage
+\tcbbreakskininto{widget}{widgetfirst}{widgetmiddle}{widgetlast}{widget}
+\tcbbreakskininto{widgetfirst}{widgetfirst}{widgetmiddle}{widgetmiddle}{widget}
+\tcbbreakskininto{widgetmiddle}{widgetmiddle}{widgetmiddle}{widgetmiddle}{widget}
+\tcbbreakskininto{widgetlast}{widgetmiddle}{widgetmiddle}{widgetlast}{widget}
+\tcbbreakskininto{draft}{draft}{draft}{draft}{draft}
+
+
+\clearpage
+\subsection{Break by Hand (Faked Break)}
+Since the appearance of broken boxes is done by skins, it is quite easy
+to 'fake a break'. For this, you actually don't need the 'breakable' library at
+all.
+
+\begin{dispExample}
+\tcbset{enhanced,equal height group=fakedbreak,
+  colback=LightGreen,colframe=DarkGreen,colbacklower=LimeGreen!75!LightGreen,
+  width=(\linewidth-6mm)/3,before=,after=,
+  left=1mm,right=1mm,top=1mm,bottom=1mm,middle=1mm}
+%
+\begin{tcolorbox}[title=My broken box,skin=enhancedfirst]
+This is a box which breaks from one column to another
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[skin=enhancedmiddle]
+column. I am sorry to say that this is a trick.
+Nevertheless, you may use this trick for your
+\end{tcolorbox}\hfill
+\begin{tcolorbox}[skin=enhancedlast]
+own purposes.
+\end{tcolorbox}
+\end{dispExample}
+
+
+
+
 % Actually, it is not a good idea to include the references like this!
 % Do not follow this bad example ...
 \begin{tcbverbatimwrite}{\jobname.bib}
@@ -2561,7 +4408,7 @@ This is my content.
    type        = {Vorlesungs-Skriptum},
    institution = {Universit{\"a}t der Bundeswehr M{\"u}nchen},
    address     = {Neubiberg},
-   url         = {http://www.unibw.de/bw/Fakultat/we2/Sturm},
+   url         = {http://www.unibw.de/bw/sturm},
    year        = 2007,
    language    = {german}
 }
@@ -2572,7 +4419,7 @@ This is my content.
    type        = {Vorlesungs-Skriptum},
    institution = {Universit{\"a}t der Bundeswehr M{\"u}nchen},
    address     = {Neubiberg},
-   url         = {http://www.unibw.de/bw/Fakultat/we2/Sturm},
+   url         = {http://www.unibw.de/bw/sturm},
    year        = 2008,
    language    = {german}
 }
@@ -2583,21 +4430,20 @@ This is my content.
    type        = {Vorlesungs-Skriptum},
    institution = {Universit{\"a}t der Bundeswehr M{\"u}nchen},
    address     = {Neubiberg},
-   url         = {http://www.unibw.de/bw/Fakultat/we2/Sturm},
+   url         = {http://www.unibw.de/bw/sturm},
    year        = 2010,
    language    = {german}
 }
 
-@book{sturm:2011b,
+@book{sturm:2012k,
    author      = {Thomas F. Sturm},
-   title       = {\LaTeX\ -- Einf{\"u}hrung in das Textsatzsystem},
-   publisher   = {Regionales Rechenzentrum f{\"u}r Niedersachsen (RRZN)},
+   title       = {\LaTeX\ -- Einführung in das Textsatzsystem},
+   publisher   = {Regionales Rechenzentrum für Niedersachsen (RRZN)},
    address     = {Hannover},
-   edition     = 8,
-   series      = {RRZN-Handb{\"u}cher},
-   url         = {http://www.rrzn.uni-hannover.de/buecher.html},
-   month       = sep,
-   year        = 2011,
+   edition     = 9,
+   series      = {RRZN-Handb\"ucher},
+   url         = {http://www.rrzn.uni-hannover.de/buch.html?&titel=latex},
+   date        = {2012-05},
    language    = {german}
 }
 
@@ -2633,6 +4479,14 @@ This is my content.
   date      = {2011-06-30}
 }
 
+@manual{breitenlohner:1998a,
+   author    = {Peter Breitenlohner},
+   title     = {The $\varepsilon$-\TeX\ manual},
+   version   = {2},
+   url       = {http://ftp.gwdg.de/pub/ctan/systems/e-tex/v2/doc/etex_man.pdf},
+   date      = {1998-02},
+}
+
 \end{tcbverbatimwrite}
 
 \clearpage
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcbbreakable.code.tex b/Master/texmf-dist/tex/latex/tcolorbox/tcbbreakable.code.tex
new file mode 100644
index 00000000000..aba156be1c6
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcbbreakable.code.tex
@@ -0,0 +1,441 @@
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
+%% tcbbreakable.code.tex: Code for breakable colorboxes
+%%
+%% -------------------------------------------------------------------------------------------
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% -------------------------------------------------------------------------------------------
+%%
+%% This work may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%%   http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of LaTeX
+%% version 2005/12/01 or later.
+%%
+%% This work has the LPPL maintenance status `author-maintained'.
+%%
+%% This work consists of all files listed in README
+%%
+\makeatletter
+\def\tcblibrary@breakable@loaded{}
+
+\let\tcb@drawcolorbox@standalone=\tcb@drawcolorbox
+
+\let\tcb@parboxrestore@true=\tcb@parboxrestore
+%\def\tcb@parboxrestore@false{\vspace{-\parskip}}
+\def\tcb@parboxrestore@false{\vskip-\parskip}
+
+\def\tcb@vbox#1#2{%
+  \edef\reserved@a{%
+    \endgroup%
+    \setbox#1\vbox{\hsize=#2%
+      \begingroup\aftergroup}%
+      \def\noexpand\@currenvir{\@currenvir}%
+      \def\noexpand\@currenvline{\on@line}}%
+  \reserved@a%
+  \@endpefalse%
+  \begingroup%
+  \csname tcb@parboxrestore@\kvtcv@parbox\endcsname%
+  \ignorespaces%
+  \let\tcb@drawcolorbox=\tcb@drawcolorbox@standalone%
+  }
+\def\endtcb@vbox{\unskip\endgroup}
+
+% remaining height
+\def\tcb@comp@h@page{%
+  \ifx\kvtcb@float\@empty%
+    \tcbdimto\tcb@h@page{\pagegoal-\pagetotal-\pageshrink-\kvtcb@shrinkbreakgoal}%
+  \else%
+    \tcbdimto\tcb@h@page{\textheight-\kvtcb@shrinkbreakgoal}%
+  \fi%
+}
+
+\def\tcb@following@title{%
+  \ifx\kvtcb@followingtitle\@empty%
+    \tcb@hasTitlefalse%
+    \edef\tcb@h@title{0pt}%
+    \edef\tcb@h@padtitle{0pt}%
+  \else%
+    \tcb@hasTitletrue%
+    \tcbdimto\tcb@w@title{\tcb@innerwidth-\kvtcb@boxsep*2-\kvtcb@lefttitle-\kvtcb@righttitle}%
+    \begin{tcb@savebox}{\tcb@titlebox}{\tcb@w@title}\color{\kvtcb@coltitle}\kvtcb@fonttitle\kvtcb@followingtitle\end{tcb@savebox}%
+    \tcbdimto\tcb@h@title{\ht\tcb@titlebox+\dp\tcb@titlebox}%
+    \tcbdimto\tcb@h@padtitle{\kvtcb@title@rule+\kvtcb@boxsep*2+\kvtcb@toptitle+\kvtcb@bottomtitle+\tcb@h@title}%
+  \fi%
+}
+
+\newbox\tcb@totalupperbox
+\newbox\tcb@totallowerbox
+
+\def\tcb@drawcolorbox@breakable{%
+  \ifx\kvtcb@float\@empty%
+    \par\nointerlineskip{\topskip\z@\null}%
+    \bgroup\@nobreakfalse\addpenalty\z@\egroup% force update vertical list
+    \setbox\z@=\vbox{\kvtcb@beforebox}%
+    \tcbdimto\tcb@h@before{\ht\z@+\dp\z@+\dimexpr\parskip\relax}%
+    \setbox\z@=\vbox{\kvtcb@afterbox}%
+    \tcbdimto\tcb@h@after{\ht\z@+\dp\z@}%
+    %
+  \else%
+    \edef\tcb@h@before{0pt}%
+    \edef\tcb@h@after{0pt}%
+  \fi%
+  \tcb@comp@h@page%
+  %
+  % height calculation
+  \tcbdimto\tcb@h@padding{\kvtcb@bbtop@stand+\kvtcb@bbbottom@stand+\kvtcb@top@rule@stand+\kvtcb@bottom@rule@stand+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom}%
+  %
+  \tcbdimto\tcb@h@total{\tcb@h@before+\tcb@h@after+\tcb@h@padding+\tcb@h@padtitle+\tcb@h@upper+\tcb@h@segment+\tcb@h@lower}%
+  %
+  \let\tcb@split@next=\relax%
+  \ifdim\tcb@h@total<\tcb@h@page\relax% no break
+    \tcb@drawcolorbox@standalone%
+  \else
+    \ifx\kvtcb@float\@empty%
+      \ifdim\dimexpr\tcb@h@page-\tcb@h@before-\tcb@h@padding-\tcb@h@padtitle<\kvtcb@breakminlines\baselineskip\relax%
+        \pagebreak\null%
+        \tcb@comp@h@page%
+        \ifdim\tcb@h@total<\tcb@h@page\relax% no break!
+          \tcb@drawcolorbox@standalone%
+        \else
+          \let\tcb@split@next=\tcb@split@first%
+        \fi
+      \else%
+        \let\tcb@split@next=\tcb@split@first%
+      \fi
+    \else%
+      \let\tcb@split@next=\tcb@split@first%
+    \fi%
+  \fi
+  \tcb@split@next%
+}
+
+\def\tcb@split@upper@box{%
+  \vfuzz=\maxdimen\vbadness=10000%
+  \setbox\tcb@upperbox=\vsplit\tcb@totalupperbox to\tcb@split@dim%
+  \setbox\tcb@upperbox=\vbox{\begingroup\color{\kvtcb@colupper}\unvbox\tcb@upperbox\endgroup}%
+  \vbadness=\tcb@thevbadness\vfuzz=\tcb@thevfuzz%
+  \tcbdimto\tcb@h@upper{\ht\tcb@upperbox+\dp\tcb@upperbox}%
+}
+
+\def\tcb@split@lower@box{%
+  \vfuzz=\maxdimen\vbadness=10000%
+  \setbox\tcb@lowerbox=\vsplit\tcb@totallowerbox to\tcb@split@dim%
+  \setbox\tcb@lowerbox=\vbox{\unvbox\tcb@lowerbox}%
+  \vbadness=\tcb@thevbadness\vfuzz=\tcb@thevfuzz%
+  \tcbdimto\tcb@h@lower{\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
+}
+
+\def\tcb@split@setstate@first{%
+  \edef\tcb@split@state{first}%
+  \let\kvtcb@top@rule=\kvtcb@top@rule@stand%
+  \let\kvtcb@bottom@rule=\kvtcb@bottom@rule@break%
+  \let\kvtcb@bbtop=\kvtcb@bbtop@stand%
+  \let\kvtcb@bbbottom=\kvtcb@bbbottom@break%
+}
+
+\def\tcb@split@setstate@middle{%
+  \edef\tcb@split@state{middle}%
+  \let\kvtcb@top@rule=\kvtcb@top@rule@break%
+  \let\kvtcb@bottom@rule=\kvtcb@bottom@rule@break%
+  \let\kvtcb@bbtop=\kvtcb@bbtop@break%
+  \let\kvtcb@bbbottom=\kvtcb@bbbottom@break%
+}
+
+\def\tcb@split@setstate@last{%
+  \edef\tcb@split@state{last}%
+  \let\kvtcb@top@rule=\kvtcb@top@rule@break%
+  \let\kvtcb@bottom@rule=\kvtcb@bottom@rule@stand%
+  \let\kvtcb@bbtop=\kvtcb@bbtop@break%
+  \let\kvtcb@bbbottom=\kvtcb@bbbottom@stand%
+}
+
+\def\tcb@split@first{%
+  \setcounter{tcbbreakpart}{1}%
+  \ifx\kvtcb@float\@empty%
+    \def\tcb@before@first{\nointerlineskip\kvtcb@beforebox}%
+    \def\tcb@before@middle{\nointerlineskip\noindent}%
+    \let\tcb@before@last=\tcb@before@middle%
+    \long\def\tcb@after@first{\parskip\z@\par\pagebreak\nointerlineskip{\topskip\z@\null}}%
+    \let\tcb@after@middle=\tcb@after@first%
+    \let\tcb@after@last=\kvtcb@afterbox%
+  \else%
+    \edef\float@start{\noexpand\@float{tcbfloat}[\kvtcb@float]}%
+    \let\tcb@before@first=\float@start%
+    \let\tcb@before@middle=\float@start%
+    \let\tcb@before@last=\float@start%
+    \let\tcb@after@first=\end@float%
+    \let\tcb@after@middle=\end@float%
+    \let\tcb@after@last=\end@float%
+  \fi%
+  %
+  \edef\kvtcb@skin@@first{\kvtcb@skin@first}%
+  \edef\kvtcb@skin@@middle{\kvtcb@skin@middle}%
+  \edef\kvtcb@skin@@last{\kvtcb@skin@last}%
+  %
+  \tcbdimto\tcb@h@padding@first{\kvtcb@bbtop@stand+\kvtcb@bbbottom@break+\kvtcb@top@rule@stand+\kvtcb@bottom@rule@break+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom}%
+  \tcbdimto\tcb@h@padding@middle{\kvtcb@bbtop@break+\kvtcb@bbbottom@break+\kvtcb@top@rule@break+\kvtcb@bottom@rule@break+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom}%
+  \tcbdimto\tcb@h@padding@last{\kvtcb@bbtop@break+\kvtcb@bbbottom@stand+\kvtcb@top@rule@break+\kvtcb@bottom@rule@stand+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom}%
+  %
+  \tcb@split@setstate@first%
+  %
+  \splittopskip=0pt%
+  \splitmaxdepth=0pt%
+  \edef\tcb@thevfuzz{\the\vfuzz}%
+  \edef\tcb@thevbadness{\the\vbadness}%
+  %
+  \setbox\tcb@totalupperbox=\vbox{\unvbox\tcb@upperbox}%
+  \setbox\tcb@totallowerbox=\vbox{\unvbox\tcb@lowerbox}%
+  %
+  \tcbdimto\tcb@split@dim{\tcb@h@page-\tcb@h@before-\tcb@h@padding@first-\tcb@h@padtitle}%
+  \ifdim\tcb@split@dim<\tcb@h@upper\relax%
+    \tcb@split@upper@box%
+    \tcb@sdraw@U%
+    \let\tcb@split@next=\tcb@split@USL%
+  \else%
+    \setbox\tcb@upperbox=\vbox{\unvbox\tcb@totalupperbox}%
+    \tcbdimto\tcb@split@dim{\tcb@split@dim-\tcb@h@upper-\tcb@h@segment}
+    \ifdim\tcb@split@dim<\kvtcb@breakminlines\baselineskip\relax%
+      \tcb@sdraw@U%
+      \let\tcb@split@next=\tcb@split@SL%
+    \else
+      \tcb@split@lower@box%
+      \tcb@sdraw@USL%
+      \let\tcb@split@next=\tcb@split@L%
+    \fi%
+  \fi%
+  \tcb@split@next%
+}
+
+
+\def\tcb@split@USL{%
+  \stepcounter{tcbbreakpart}%
+  \tcb@following@title%
+  \tcb@comp@h@page%
+  \tcbdimto\tcb@h@upper{\ht\tcb@totalupperbox+\dp\tcb@totalupperbox}%
+  \tcbdimto\tcb@h@total{\tcb@h@after+\tcb@h@padding@last+\tcb@h@padtitle+\tcb@h@upper+\tcb@h@segment+\tcb@h@lower}%
+  %
+  \ifdim\tcb@h@total<\tcb@h@page\relax% no break
+    \tcb@split@setstate@last%
+    \setbox\tcb@upperbox=\vbox{\begingroup\color{\kvtcb@colupper}\unvbox\tcb@totalupperbox\endgroup}%
+    \setbox\tcb@lowerbox=\vbox{\begingroup\color{\kvtcb@collower}\unvbox\tcb@totallowerbox\endgroup}%
+    \iftcb@lowerspace%
+      \tcb@sdraw@USL%
+    \else
+      \tcb@sdraw@U%
+    \fi%
+    \let\tcb@split@next=\relax%
+  \else
+    \tcb@split@setstate@middle%
+    \tcbdimto\tcb@split@dim{\tcb@h@page-\tcb@h@padding@middle-\tcb@h@padtitle}%
+    \ifdim\tcb@split@dim<\tcb@h@upper\relax%
+      \tcb@split@upper@box%
+      \tcb@sdraw@U%
+      \let\tcb@split@next=\tcb@split@USL%
+    \else%
+      \setbox\tcb@upperbox=\vbox{\begingroup\color{\kvtcb@colupper}\unvbox\tcb@totalupperbox\endgroup}%
+      \tcbdimto\tcb@split@dim{\tcb@split@dim-\tcb@h@upper-\tcb@h@segment}
+      \ifdim\tcb@split@dim<\kvtcb@breakminlines\baselineskip\relax%
+        \tcb@sdraw@U%
+        \let\tcb@split@next=\tcb@split@SL%
+      \else
+        \tcb@split@lower@box%
+        \tcb@sdraw@USL%
+        \let\tcb@split@next=\tcb@split@L%
+      \fi%
+    \fi%
+  \fi%
+  \tcb@split@next%
+}
+
+
+\def\tcb@split@SL{%
+  \stepcounter{tcbbreakpart}%
+  \tcb@following@title%
+  \tcb@comp@h@page%
+  \edef\tcb@h@upper{0pt}%
+  \tcbdimto\tcb@h@lower{\ht\tcb@totallowerbox+\dp\tcb@totallowerbox}%
+  \tcbdimto\tcb@h@total{\tcb@h@after+\tcb@h@padding@last-\kvtcb@top+\tcb@h@padtitle+\tcb@h@segment+\tcb@h@lower}%
+  %
+  \ifdim\tcb@h@total<\tcb@h@page\relax% no break
+    \tcb@split@setstate@last%
+    \setbox\tcb@lowerbox=\vbox{\begingroup\color{\kvtcb@collower}\unvbox\tcb@totallowerbox\endgroup}%
+    \tcb@sdraw@SL%
+    \let\tcb@split@next=\relax%
+  \else
+    \tcb@split@setstate@middle%
+    \tcbdimto\tcb@split@dim{\tcb@h@page-\tcb@h@padding@middle+\kvtcb@top-\tcb@h@padtitle-\tcb@h@segment}%
+    \tcb@split@lower@box%
+    \tcb@sdraw@SL%
+    \let\tcb@split@next=\tcb@split@L%
+  \fi%
+  \tcb@split@next%
+}
+
+
+\def\tcb@split@L{%
+  \stepcounter{tcbbreakpart}%
+  \tcb@following@title%
+  \tcb@comp@h@page%
+  \edef\tcb@h@upper{0pt}%
+  \tcbdimto\tcb@h@lower{\ht\tcb@totallowerbox+\dp\tcb@totallowerbox}%
+  \tcbdimto\tcb@h@total{\tcb@h@after+\tcb@h@padding@last+\tcb@h@padtitle+\tcb@h@lower}%
+  %
+  \ifdim\tcb@h@total<\tcb@h@page\relax% no break
+    \tcb@split@setstate@last%
+    \setbox\tcb@lowerbox=\vbox{\begingroup\color{\kvtcb@collower}\unvbox\tcb@totallowerbox\endgroup}%
+    \tcb@sdraw@L%
+    \let\tcb@split@next=\relax%
+  \else
+    \tcb@split@setstate@middle%
+    \tcbdimto\tcb@split@dim{\tcb@h@page-\tcb@h@padding@middle-\tcb@h@padtitle}%
+    \tcb@split@lower@box%
+    \tcb@sdraw@L%
+    \let\tcb@split@next=\tcb@split@L%
+  \fi%
+  \tcb@split@next%
+}
+
+
+\def\tcb@sdraw@USL{%
+  \tcbset{skin=\csname kvtcb@skin@@\tcb@split@state\endcsname}%
+  \def\tcb@segment@state{1}%
+  \tcbdimto\tcb@natheight{\tcb@h@padtitle+\kvtcb@top@rule+\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom+\tcb@h@upper+\tcb@h@segment+\tcb@h@lower}%
+  \tcb@ch@natural%
+  \tcbdimto\tcb@innerheight{\tcb@height-\kvtcb@top@rule-\kvtcb@bottom@rule-\tcb@h@padtitle}%
+  \csname tcb@before@\tcb@split@state\endcsname%
+  \begin{\kvtcb@graphenv}%
+    \tcb@bbdraw%
+     % draw frame and interior
+    \csname tcb@drawframe@\kvtcb@engine@frame\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawwithtitle@\kvtcb@engine@interiortitled\endcsname%
+    \else%
+      \csname tcb@drawwithouttitle@\kvtcb@engine@interior\endcsname%
+    \fi%
+    \csname tcb@drawlower@\kvtcb@engine@segmentation\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawtitle@\kvtcb@engine@title\endcsname%
+    \fi%
+    \csname tcb@overlay@\tcb@split@state\endcsname%
+    % draw text boxes
+    \tcb@tdraw@title%
+    \tcb@tdraw@upper%
+    \tcb@tdraw@lower%
+  \end{\kvtcb@graphenv}%
+  \csname tcb@after@\tcb@split@state\endcsname%
+}
+
+
+\def\tcb@sdraw@U{%
+  \tcbset{skin=\csname kvtcb@skin@@\tcb@split@state\endcsname}%
+  \def\tcb@segment@state{0}%
+  \tcbdimto\tcb@natheight{\tcb@h@padtitle+\kvtcb@top@rule+\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom+\tcb@h@upper}%
+  \tcb@ch@natural%
+  \tcbdimto\tcb@innerheight{\tcb@height-\kvtcb@top@rule-\kvtcb@bottom@rule-\tcb@h@padtitle}%
+  \csname tcb@before@\tcb@split@state\endcsname%
+  \begin{\kvtcb@graphenv}%
+    \tcb@bbdraw%
+    % draw frame and interior
+    \csname tcb@drawframe@\kvtcb@engine@frame\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawwithtitle@\kvtcb@engine@interiortitled\endcsname%
+    \else%
+      \csname tcb@drawwithouttitle@\kvtcb@engine@interior\endcsname%
+    \fi%
+    \iftcb@hasTitle%
+      \csname tcb@drawtitle@\kvtcb@engine@title\endcsname%
+    \fi%
+    \csname tcb@overlay@\tcb@split@state\endcsname%
+    % draw text boxes
+    \tcb@tdraw@title%
+    \tcb@tdraw@upper%
+  \end{\kvtcb@graphenv}%
+  \csname tcb@after@\tcb@split@state\endcsname%
+}
+
+
+\def\tcb@sdraw@SL{%
+  \tcbset{skin=\csname kvtcb@skin@@\tcb@split@state\endcsname}%
+  \def\tcb@segment@state{1}%
+  \tcbdimto\tcb@natheight{\tcb@h@padtitle+\kvtcb@top@rule+\kvtcb@bottom@rule+\kvtcb@bottom+\tcb@h@segment+\tcb@h@lower}%
+  \tcb@ch@natural%
+  \tcbdimto\tcb@innerheight{\tcb@height-\kvtcb@top@rule-\kvtcb@bottom@rule-\tcb@h@padtitle}%
+  \csname tcb@before@\tcb@split@state\endcsname%
+  \begin{\kvtcb@graphenv}%
+    \tcb@bbdraw%
+    % draw frame and interior
+    \csname tcb@drawframe@\kvtcb@engine@frame\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawwithtitle@\kvtcb@engine@interiortitled\endcsname%
+    \else%
+      \csname tcb@drawwithouttitle@\kvtcb@engine@interior\endcsname%
+    \fi%
+    \csname tcb@drawlower@\kvtcb@engine@segmentation\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawtitle@\kvtcb@engine@title\endcsname%
+    \fi%
+    \csname tcb@overlay@\tcb@split@state\endcsname%
+    % draw text boxes
+    \tcb@tdraw@title%
+    \tcb@tdraw@lower%
+  \end{\kvtcb@graphenv}%
+  \csname tcb@after@\tcb@split@state\endcsname%
+}
+
+
+\def\tcb@sdraw@L{%
+  \tcbset{skin=\csname kvtcb@skin@@\tcb@split@state\endcsname}%
+  \def\tcb@segment@state{2}%
+  \tcbdimto\tcb@natheight{\tcb@h@padtitle+\kvtcb@top@rule+\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom+\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
+  \tcb@ch@natural%
+  \tcbdimto\tcb@innerheight{\tcb@height-\kvtcb@top@rule-\kvtcb@bottom@rule-\tcb@h@padtitle}%
+  \csname tcb@before@\tcb@split@state\endcsname%
+  \begin{\kvtcb@graphenv}%
+    \tcb@bbdraw%
+    % draw frame and interior
+    \csname tcb@drawframe@\kvtcb@engine@frame\endcsname%
+    \iftcb@hasTitle%
+      \csname tcb@drawwithtitle@\kvtcb@engine@interiortitled\endcsname%
+    \else%
+      \csname tcb@drawwithouttitle@\kvtcb@engine@interior\endcsname%
+    \fi%
+    \iftcb@hasTitle%
+      \csname tcb@drawtitle@\kvtcb@engine@title\endcsname%
+    \fi%
+    \csname tcb@overlay@\tcb@split@state\endcsname%
+    % draw text boxes
+    \tcb@tdraw@title%
+    \tcb@tdraw@lower%
+  \end{\kvtcb@graphenv}%
+  \csname tcb@after@\tcb@split@state\endcsname%
+}
+
+
+
+\tcbset{%
+  breakable@true/.code={%
+    \let\tcb@savebox=\tcb@vbox%
+    \let\endtcb@savebox=\endtcb@vbox%
+    \let\tcb@drawcolorbox=\tcb@drawcolorbox@breakable},
+  breakable@false/.code={%
+    \let\tcb@savebox=\tcb@lrbox%
+    \let\endtcb@savebox=\endtcb@lrbox%
+    \let\tcb@drawcolorbox=\tcb@drawcolorbox@standalone},
+  breakable/.style={breakable@#1},
+  breakable/.default=true,%
+  unbreakable/.style={breakable=false},
+  title after break/.store in=\kvtcb@followingtitle,
+  notitle after break/.style={title after break=},
+  adjusted title after break/.style={title after break={#1\vphantom{\kvtcb@adjusttext}}},
+  lines before break/.store in=\kvtcb@breakminlines,
+  shrink break goal/.store in=\kvtcb@shrinkbreakgoal,
+}
+
+\tcbset{%
+  notitle after break,
+  shrink break goal=0pt,
+  lines before break=2,
+}
+
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcbdocumentation.code.tex b/Master/texmf-dist/tex/latex/tcolorbox/tcbdocumentation.code.tex
index 2745ced459c..7a9734de709 100644
--- a/Master/texmf-dist/tex/latex/tcolorbox/tcbdocumentation.code.tex
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcbdocumentation.code.tex
@@ -1,8 +1,8 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcbdocumentation.code.tex: Code for LaTeX documentations
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcblistings.code.tex b/Master/texmf-dist/tex/latex/tcolorbox/tcblistings.code.tex
index 90402d26999..4955eec9f6b 100644
--- a/Master/texmf-dist/tex/latex/tcolorbox/tcblistings.code.tex
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcblistings.code.tex
@@ -1,8 +1,8 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcblistings.code.tex: Code for colorboxes with listings
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcbskins.code.tex b/Master/texmf-dist/tex/latex/tcolorbox/tcbskins.code.tex
index fcafaca3206..72bed16be68 100644
--- a/Master/texmf-dist/tex/latex/tcolorbox/tcbskins.code.tex
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcbskins.code.tex
@@ -1,8 +1,8 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcbskins.code.tex: Code for colorboxes with different skins
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
@@ -25,44 +25,148 @@
 \def\tcb@creategeonodes@true{%
   \begin{scope}[every node/.style={line width=0mm,inner sep=0mm,draw=none,fill=none,rectangle}]
     \node[name=frame,at={(0,0)},above right,minimum width=\kvtcb@width,minimum height=\tcb@height]{};
-    \node[name=interior,at={({\kvtcb@boxrule},{\kvtcb@boxrule})},above right,minimum width=\kvtcb@width-\kvtcb@boxrule*2,minimum height=\tcb@innerheight]{};
-    \iftcb@lowerspace%
-    \node[name=segmentation,at={({\kvtcb@boxrule},{\kvtcb@boxrule+\kvtcb@boxsep*2+\kvtcb@bottom+\tcb@height@lower})},above right,
-       minimum width=\kvtcb@width-\kvtcb@boxrule*2,minimum height=\kvtcb@middle*2]{};
+    \node[name=interior,at={({\kvtcb@left@rule},{\kvtcb@bottom@rule})},above right,minimum width=\tcb@innerwidth,minimum height=\tcb@innerheight]{};
+    \ifnum\tcb@segment@state=1%
+    \node[name=segmentation,at={({\kvtcb@left@rule},{\the\dimexpr\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@bottom+\tcb@height@lower\relax})},above right,
+       minimum width=\tcb@innerwidth,minimum height=\the\dimexpr\kvtcb@middle*2\relax]{};
+    \fi%
+    \iftcb@hasTitle%
+    \node[name=title,at={({\kvtcb@left@rule},{\the\dimexpr\kvtcb@bottom@rule+\tcb@innerheight+\kvtcb@title@rule\relax})},above right,
+       minimum width=\tcb@innerwidth,minimum height=\the\dimexpr\tcb@h@title+\kvtcb@toptitle+\kvtcb@bottomtitle+\kvtcb@boxsep*2\relax]{};
     \fi%
   \end{scope}%
 }
 
+\def\tcb@spec#1{\tikzset{tcb@spec/.style={#1}}}
+
 % fill frame
 \def\tcb@drawframe@path{%
-  \path[fill=\kvtcb@colframe,rounded corners=\kvtcb@arc+\kvtcb@boxrule,frame@style]
+  \path[fill=\kvtcb@colframe,rounded corners=\tcb@outer@arc,tcb@spec,frame@style]
   (frame.south west) rectangle (frame.north east);%
 }
 
+\def\tcb@drawframe@pathfirst{%
+  \path[fill=\kvtcb@colframe,rounded corners=\tcb@outer@arc,tcb@spec,frame@style]
+      (frame.south west) -- (frame.north west) --
+      (frame.north east)[sharp corners] -- (frame.south east) -- cycle;%
+}
+
+\def\tcb@drawframe@pathmiddle{%
+  \path[fill=\kvtcb@colframe,tcb@spec,frame@style]
+      (frame.south west) rectangle (frame.north east);%
+}
+
+\def\tcb@drawframe@pathlast{%
+  \path[fill=\kvtcb@colframe,rounded corners=\tcb@outer@arc,tcb@spec,frame@style]
+      (frame.north east) -- (frame.south east) --
+      (frame.south west)[sharp corners] -- (frame.north west) -- cycle;
+}
+
 % fill inner box with title
 \def\tcb@drawwithtitle@path{%
-  \path[fill=\kvtcb@colback,interior@style] (interior.north west)
+  \path[fill=\kvtcb@colback,tcb@spec,interior@style] (interior.north west)
     --(interior.north east)[rounded corners=\kvtcb@arc]
     --(interior.south east)--(interior.south west)[sharp corners]
     -- cycle;%
 }
 
+\def\tcb@drawwithtitle@pathfirst{%
+  \path[fill=\kvtcb@colback,tcb@spec,interior@style]
+    (interior.south west|-frame.south west) rectangle (interior.north east);%
+}
+
+\let\tcb@drawwithtitle@pathmiddle=\tcb@drawwithtitle@pathfirst
+
+\let\tcb@drawwithtitle@pathlast=\tcb@drawwithtitle@path
+
 % fill inner box without title
 \def\tcb@drawwithouttitle@path{%
-  \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,interior@style]
+  \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,tcb@spec,interior@style]
   (interior.south west) rectangle (interior.north east);%
 }
 
+\def\tcb@drawwithouttitle@pathfirst{%
+  \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,tcb@spec,interior@style]
+    (interior.south west|-frame.south west) -- (interior.north west) --
+    (interior.north east)[sharp corners] -- (interior.south east|-frame.south east) -- cycle;%
+}
+
+\def\tcb@drawwithouttitle@pathmiddle{%
+  \path[fill=\kvtcb@colback,tcb@spec,interior@style]
+    (interior.south west|-frame.south west) rectangle (interior.north east|-frame.north east);%
+}
+
+\def\tcb@drawwithouttitle@pathlast{%
+  \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,tcb@spec,interior@style]
+    (interior.north east|-frame.north east) -- (interior.south east) --
+    (interior.south west)[sharp corners] -- (interior.north west|-frame.north west) -- cycle;%
+}
+
+
 % draw segmentation line
 \def\tcb@drawlower@path{%
-  \path[draw=\kvtcb@colframe,dashed,segmentation@style]
+  \path[draw=\kvtcb@colframe,dashed,tcb@spec,segmentation@style]
   (segmentation.west)--(segmentation.east);%
 }
 
+% draw title box
+\def\tcb@drawtitle@path{%
+  \path[tcb@spec,title@style]
+  (title.south east)--(title.south west)[rounded corners=\kvtcb@arc]
+    -- (title.north west)--(title.north east)[sharp corners]
+    -- cycle;%
+}
+
+\let\tcb@drawtitle@pathfirst=\tcb@drawtitle@path
+
+\def\tcb@drawtitle@pathmiddle{%
+  \path[tcb@spec,title@style] (title.south west) rectangle (title.north east);%
+}
+
+\let\tcb@drawtitle@pathlast=\tcb@drawtitle@pathmiddle
+
+% draw special versions
+\def\tcb@drawspec@UT#1{%
+  \path[#1,interior@style]
+    (segmentation.west) rectangle (interior.north east);%
+}
+
+\def\tcb@drawspec@UR#1{%
+  \path[#1,interior@style]
+    (segmentation.east)--(segmentation.west)[rounded corners=\kvtcb@arc]
+    -- (interior.north west)--(interior.north east)[sharp corners]
+    -- cycle;%
+}
+
+\def\tcb@drawspec@US#1{%
+  \path[#1,interior@style]
+    (segmentation.west) rectangle (interior.north east|-frame.north east);
+}
+
+\def\tcb@drawspec@LR#1{%
+  \path[#1,segmentation@style]
+  ([yshift=0.1mm]segmentation.west)--([yshift=0.1mm]segmentation.east)[rounded corners=\kvtcb@arc]
+    --(interior.south east)--(interior.south west)[sharp corners]
+    -- cycle;%
+}
+
+\def\tcb@drawspec@LS#1{%
+  \path[#1,segmentation@style]
+    (interior.south west|-frame.south west) rectangle
+    ([yshift=0.1mm]segmentation.east);%
+}
+
+\def\tcb@drawspec@T{%
+  \path[top color=\kvtcb@colframe,bottom color=\kvtcb@colback]
+      ([yshift=-0.01pt]interior.north west) rectangle
+      ([yshift=0.01pt]title.south east);%
+}
+
 \def\tcb@drawframe@freelance{\tcb@frame@code}
 \def\tcb@drawwithtitle@freelance{\tcb@interiortitled@code}
 \def\tcb@drawwithouttitle@freelance{\tcb@interior@code}
 \def\tcb@drawlower@freelance{\tcb@segmentation@code}
+\def\tcb@drawtitle@freelance{\tcb@title@code}
 
 \tcbset{%
   frame style/.code={\tikzset{frame@style/.style={#1}}},%
@@ -76,7 +180,11 @@
   segmentation style/.code={\tikzset{segmentation@style/.style={#1}}},%
   segmentation code/.code={\def\tcb@segmentation@code{#1}},%
   segmentation code/.default=\tcb@drawlower@standard,%
+  title style/.code={\tikzset{title@style/.style={#1}}},%
+  title code/.code={\def\tcb@title@code{#1}},%
+  title code/.default=\tcb@drawtitle@standard,%
   colbacklower/.store in=\kvtcb@colbacklower,%
+  clear@spec/.code={\tcb@spec{}},%
 }
 
 \tcbset{%
@@ -87,107 +195,431 @@
   interior titled code,%
   interior code,%
   segmentation code,%
-  colbacklower=black!15!white,
+  title style=,%
+  title code,%
+  colbacklower=black!15!white,%
+  clear@spec%
 }
 
-\tcbset{skin@enhanced/.style={%
+
+\tcbset{skin@enhanced/.style={clear@spec,%
   graphical environment=tikzpicture,geometry nodes,
   frame engine=path,interior titled engine=path,
-  interior engine=path,segmentation engine=path
+  interior engine=path,segmentation engine=path,title engine=path,
+  skin first=enhancedfirst,skin middle=enhancedmiddle,skin last=enhancedlast},
+  enhanced/.style={skin=enhanced}}
+
+\tcbset{skin@enhancedfirst/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathfirst,interior titled engine=pathfirst,
+  interior engine=pathfirst,segmentation engine=path,title engine=pathfirst,
+  skin first=enhancedfirst,skin middle=enhancedmiddle,skin last=enhancedmiddle
 }}
 
-\tcbset{skin@freelance/.style={%
+\tcbset{skin@enhancedmiddle/.style={clear@spec,%
   graphical environment=tikzpicture,geometry nodes,
-  frame engine=freelance,interior titled engine=freelance,
-  interior engine=freelance,segmentation engine=freelance
+  frame engine=pathmiddle,interior titled engine=pathmiddle,
+  interior engine=pathmiddle,segmentation engine=path,title engine=pathmiddle,
+  skin first=enhancedmiddle,skin middle=enhancedmiddle,skin last=enhancedmiddle
 }}
 
-\tcbset{skin@bicolor/.style={%
+\tcbset{skin@enhancedlast/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathlast,interior titled engine=pathlast,
+  interior engine=pathlast,segmentation engine=path,title engine=pathlast,
+  skin first=enhancedmiddle,skin middle=enhancedmiddle,skin last=enhancedlast
+}}
+
+\tcbset{skin@freelance/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=freelance,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=freelance,
+  skin first=freelance,skin middle=freelance,skin last=freelance},
+  freelance/.style={skin=freelance}}
+
+\tcbset{skin@bicolor/.style={clear@spec,%
   graphical environment=tikzpicture,geometry nodes,
   frame engine=path,interior titled engine=freelance,
-  interior engine=freelance,segmentation engine=freelance,
-  interior style=,
+  interior engine=freelance,segmentation engine=freelance,title engine=path,
   interior titled code={%
-    \iftcb@lowerspace%
-    \path[fill=\kvtcb@colback,interior@style]
-      (segmentation.west) rectangle (interior.north east);%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithtitle@path}%
+    \or%
+    \tcb@drawspec@UT{fill=\kvtcb@colback}%
     \else%
-    \path[fill=\kvtcb@colback,interior@style]
-      (interior.north west)--(interior.north east)[rounded corners=\kvtcb@arc]
-      --(interior.south east)--(interior.south west)[sharp corners]
-      -- cycle;%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithtitle@path}%
     \fi},
   interior code={%
-    \iftcb@lowerspace%
-    \path[fill=\kvtcb@colback,interior@style]
-      (segmentation.east)--(segmentation.west)[rounded corners=\kvtcb@arc]
-      -- (interior.north west)--(interior.north east)[sharp corners]
-      -- cycle;%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithouttitle@path}%
+    \or%
+    \tcb@drawspec@UR{fill=\kvtcb@colback}%
+    \else%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithouttitle@path}%
+    \fi},
+  segmentation code={\tcb@drawspec@LR{fill=\kvtcb@colbacklower}},%
+  skin first=bicolorfirst,skin middle=bicolormiddle,skin last=bicolorlast},
+  bicolor/.style={skin=bicolor}}
+
+\tcbset{skin@bicolorfirst/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathfirst,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathfirst,
+  interior titled code={%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithtitle@pathfirst}%
+    \or%
+    \tcb@drawspec@UT{fill=\kvtcb@colback}%
     \else%
-    \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,interior@style]
-      (interior.south west) rectangle (interior.north east);%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithtitle@pathfirst}%
     \fi},
-  segmentation code={%
-    \path[fill=\kvtcb@colbacklower,segmentation@style]
-    ([yshift=0.1mm]segmentation.west)--([yshift=0.1mm]segmentation.east)[rounded corners=\kvtcb@arc]
-      --(interior.south east)--(interior.south west)[sharp corners]
-      -- cycle;}%
+  interior code={%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithouttitle@pathfirst}%
+    \or%
+    \tcb@drawspec@UR{fill=\kvtcb@colback}%
+    \else%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithouttitle@pathfirst}%
+    \fi},
+  segmentation code={\tcb@drawspec@LS{fill=\kvtcb@colbacklower}},
+  skin first=bicolorfirst,skin middle=bicolormiddle,skin last=bicolormiddle
 }}
 
-\tcbset{skin@beamer/.style={%
+\tcbset{skin@bicolormiddle/.style={clear@spec,%
   graphical environment=tikzpicture,geometry nodes,
-  frame engine=path,interior titled engine=freelance,
-  interior engine=freelance,segmentation engine=freelance,
-  boxrule=0mm,arc=2mm,frame style={fill=\kvtcb@colframe,drop shadow},
-  fonttitle=\bfseries,interior style=,
+  frame engine=pathmiddle,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathmiddle,
   interior titled code={%
-    \iftcb@lowerspace%
-    \path[top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black,interior@style]
-      (segmentation.west) rectangle (interior.north east);%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithtitle@pathmiddle}%
+    \or%
+    \tcb@drawspec@UT{fill=\kvtcb@colback}%
     \else%
-    \path[top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black,interior@style]
-      (interior.north west)--(interior.north east)[rounded corners=\kvtcb@arc]
-      --(interior.south east)--(interior.south west)[sharp corners]
-      -- cycle;%
-    \fi%
-    \path[top color=\kvtcb@colframe,bottom color=\kvtcb@colback]
-      ([yshift=-0.5mm]interior.north west) rectangle
-      ([yshift=0.5mm]interior.north east);},
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithtitle@pathmiddle}%
+    \fi},
   interior code={%
-    \iftcb@lowerspace%
-    \path[top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black,interior@style]
-      (segmentation.east)--(segmentation.west)[rounded corners=\kvtcb@arc]
-      -- (interior.north west)--(interior.north east)[sharp corners]
-      -- cycle;%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithouttitle@pathmiddle}%
+    \or%
+    \tcb@drawspec@US{fill=\kvtcb@colback}%
+    \else%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithouttitle@pathmiddle}%
+    \fi},
+  segmentation code={\tcb@drawspec@LS{fill=\kvtcb@colbacklower}},
+  skin first=bicolormiddle,skin middle=bicolormiddle,skin last=bicolormiddle
+}}
+
+\tcbset{skin@bicolorlast/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathlast,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathlast,
+  interior titled code={%
+    \ifcase\tcb@segment@state
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithtitle@pathlast}%
+    \or%
+    \tcb@drawspec@UT{fill=\kvtcb@colback}%
     \else%
-    \path[top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black,rounded corners=\kvtcb@arc,interior@style]
-      (interior.south west) rectangle (interior.north east);%
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithtitle@pathlast}%
+    \fi},
+  interior code={%
+    \ifcase\tcb@segment@state%
+    {\tcb@spec{fill=\kvtcb@colback}\tcb@drawwithouttitle@pathlast}%
+    \or%
+    \tcb@drawspec@US{fill=\kvtcb@colback}%
+    \else
+    {\tcb@spec{fill=\kvtcb@colbacklower}\tcb@drawwithouttitle@pathlast}%
     \fi},
-  segmentation code={%
-    \path[top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black,interior@style]
-      (segmentation.west)--(segmentation.east)[rounded corners=\kvtcb@arc]
-      --(interior.south east)--(interior.south west)[sharp corners]
-      -- cycle;}%
+  segmentation code={\tcb@drawspec@LR{fill=\kvtcb@colbacklower}},%
+  skin first=bicolormiddle,skin middle=bicolormiddle,skin last=bicolorlast
 }}
 
-\tcbset{skin@widget/.style={%
+
+\tikzset{beamer@color/.style={top color=\kvtcb@colback,bottom color=\kvtcb@colback!85!black}}
+
+\tcbset{%
+  skin@beamer/.style={clear@spec,%
   graphical environment=tikzpicture,geometry nodes,
   frame engine=path,interior titled engine=freelance,
-  interior engine=freelance,segmentation engine=freelance,
-  arc=0.5mm,frame style={fill=\kvtcb@colframe},
-  interior style=,segmentation style=,fonttitle=\bfseries,
+  interior engine=freelance,segmentation engine=freelance,title engine=path,
   interior titled code={%
-    \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,interior@style]
-    (interior.south west) rectangle ([xshift={-\kvtcb@boxrule},yshift={-\kvtcb@boxrule}]frame.north east);
-    \path[left color=\kvtcb@colframe!75!white,right color=\kvtcb@colframe!75!white!25!\kvtcb@colback,interior@style]
-    (interior.north east)--(interior.north west)[rounded corners=\kvtcb@arc]
-      -- ([xshift={\kvtcb@boxrule},yshift={-\kvtcb@boxrule}]frame.north west)--([xshift={-\kvtcb@boxrule},yshift={-\kvtcb@boxrule}]frame.north east)[sharp corners]
-      -- cycle;},
+    \ifnum\tcb@segment@state=1%
+    \tcb@drawspec@UT{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithtitle@path}%
+    \fi%
+    \tcb@drawspec@T},
+  interior code={%
+    \ifnum\tcb@segment@state=1
+    \tcb@drawspec@UR{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithouttitle@path}%
+    \fi},
+  segmentation code={\tcb@drawspec@LR{beamer@color}},%
+  skin first=beamerfirst,skin middle=beamermiddle,skin last=beamerlast},
+  beamer/.style={skin=beamer,boxrule=0mm,titlerule=1mm,toptitle=0.5mm,arc=2mm,fonttitle=\bfseries,
+    frame style={fill=\kvtcb@colframe,drop shadow}},
+}
+
+\tcbset{%
+  skin@beamerfirst/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathfirst,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathfirst,
+  interior titled code={%
+    \ifnum\tcb@segment@state=1%
+    \tcb@drawspec@UT{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithtitle@pathfirst}%
+    \fi%
+    \tcb@drawspec@T},
+  interior code={%
+    \ifnum\tcb@segment@state=1
+    \tcb@drawspec@UR{beamer@color}\else%
+    {\tcb@spec{beamer@color}\tcb@drawwithouttitle@pathfirst}%
+    \fi},
+  segmentation code={\tcb@drawspec@LS{beamer@color}},%
+  skin first=beamerfirst,skin middle=beamermiddle,skin last=beamermiddle}}
+
+\tcbset{%
+  skin@beamermiddle/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathmiddle,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathmiddle,
+  interior titled code={%
+    \ifnum\tcb@segment@state=1%
+    \tcb@drawspec@UT{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithtitle@pathmiddle}%
+    \fi%
+    \tcb@drawspec@T},
   interior code={%
-    \path[fill=\kvtcb@colback,rounded corners=\kvtcb@arc,interior@style]
-    (interior.south west) rectangle (interior.north east);},
-  segmentation code={%
-    \path[left color=\kvtcb@colframe!75!white,right color=\kvtcb@colframe!75!white!25!\kvtcb@colback,segmentation@style]
-    ([yshift={-\kvtcb@middle/4}]segmentation.west) rectangle ([yshift={\kvtcb@middle/4}]segmentation.east);}%
+    \ifnum\tcb@segment@state=1
+    \tcb@drawspec@US{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithouttitle@pathmiddle}%
+    \fi},
+  segmentation code={\tcb@drawspec@LS{beamer@color}},%
+  skin first=beamermiddle,skin middle=beamermiddle,skin last=beamermiddle}}
+
+\tcbset{%
+  skin@beamerlast/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathlast,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=freelance,title engine=pathlast,
+  interior titled code={%
+    \ifnum\tcb@segment@state=1%
+    \tcb@drawspec@UT{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithtitle@pathlast}%
+    \fi%
+    \tcb@drawspec@T},
+  interior code={%
+    \ifnum\tcb@segment@state=1
+    \tcb@drawspec@US{beamer@color}%
+    \else%
+    {\tcb@spec{beamer@color}\tcb@drawwithouttitle@pathlast}%
+    \fi},
+  segmentation code={\tcb@drawspec@LR{beamer@color}},%
+  skin first=beamermiddle,skin middle=beamermiddle,skin last=beamerlast}}
+
+
+\def\tcb@drawspec@widgetsegment{%
+  \path[left color=\kvtcb@colframe!75!white,right color=\kvtcb@colframe!75!white!25!\kvtcb@colback,segmentation@style]
+    ([yshift={-\kvtcb@middle/4}]segmentation.west) rectangle ([yshift={\kvtcb@middle/4}]segmentation.east);
+}
+
+\tikzset{widget@color/.style={left color=\kvtcb@colframe!75!white,right color=\kvtcb@colframe!75!white!25!\kvtcb@colback}}
+
+\tcbset{skin@widget/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=path,interior titled engine=path,
+  interior engine=path,segmentation engine=freelance,title engine=freelance,
+  title code={{\tcb@spec{widget@color}\tcb@drawtitle@path}},
+  segmentation code={\tcb@drawspec@widgetsegment},%
+  skin first=widgetfirst,skin middle=widgetmiddle,skin last=widgetlast},
+  widget/.style={skin=widget,arc=0.5mm,fonttitle=\bfseries,
+    titlerule=0mm,toprule at break=0mm},
+}
+
+\tcbset{skin@widgetfirst/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathfirst,interior titled engine=pathfirst,
+  interior engine=pathfirst,segmentation engine=freelance,title engine=freelance,
+  title code={{\tcb@spec{widget@color}\tcb@drawtitle@pathfirst}},
+  segmentation code={\tcb@drawspec@widgetsegment},%
+  skin first=widgetfirst,skin middle=widgetmiddle,skin last=widgetmiddle}}
+
+\tcbset{skin@widgetmiddle/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathmiddle,interior titled engine=pathmiddle,
+  interior engine=pathmiddle,segmentation engine=freelance,title engine=freelance,
+  title code={{\tcb@spec{widget@color}\tcb@drawtitle@pathmiddle}},
+  segmentation code={\tcb@drawspec@widgetsegment},%
+  skin first=widgetmiddle,skin middle=widgetmiddle,skin last=widgetmiddle}}
+
+
+\tcbset{skin@widgetlast/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=pathlast,interior titled engine=pathlast,
+  interior engine=pathlast,segmentation engine=freelance,title engine=freelance,
+  title code={{\tcb@spec{widget@color}\tcb@drawtitle@pathlast}},
+  segmentation code={\tcb@drawspec@widgetsegment},%
+    skin first=widgetmiddle,skin middle=widgetmiddle,skin last=widgetlast}}
+
+
+\tcbset{skin@draft/.style={clear@spec,%
+  graphical environment=tikzpicture,geometry nodes,
+  frame engine=freelance,interior titled engine=freelance,
+  interior engine=freelance,segmentation engine=path,title engine=path,
+  skin first=draft,skin middle=draft,skin last=draft,
+  interior style=,frame style=,segmentation style={draw=black,dashed},
+  colupper=black!50!white,collower=black!50!white,coltitle=black!50!white,
+  frame code={%
+    \path[draw=blue!10!white,double,line width=1pt,dashed] (current bounding box.south west) rectangle (current bounding box.north east);
+    {\tcb@spec{fill=black!15!white,draw=black}\tcb@drawframe@path}%
+    \iftcb@hasTitle%
+      \path[fill=red!10!white,draw,dotted,rounded corners=\kvtcb@arc]
+        ([xshift={\kvtcb@left@rule},yshift={\kvtcb@bottom@rule}]frame.south west) rectangle
+        (interior.north east);
+      \path[fill=red!10!white,draw,dotted,rounded corners=\kvtcb@arc]
+        ([yshift={\kvtcb@title@rule}]interior.north west) rectangle
+        ([xshift={-\kvtcb@right@rule},yshift={-\kvtcb@top@rule}]frame.north east);
+      \path[fill=white,draw,dotted]
+        ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]title.south west) rectangle
+        ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]title.north east);
+      \path[fill=green!20!white,draw=green!75!black,dashed]
+        ([xshift={\kvtcb@boxsep+\kvtcb@lefttitle},yshift={\kvtcb@boxsep+\kvtcb@bottomtitle}]title.south west)
+         rectangle node[font=\scriptsize] {title: w=\tcb@w@title, h=\tcb@h@title}
+        +(\tcb@w@title,\tcb@h@title);
+      \path[draw=red,opacity=0.5] (title.south west) rectangle (title.north east);
+    \else%
+      \path[fill=red!10!white,draw,dotted,rounded corners=\kvtcb@arc]
+        ([xshift={\kvtcb@left@rule},yshift={\kvtcb@bottom@rule}]frame.south west) rectangle
+        ([xshift={-\kvtcb@right@rule},yshift={-\kvtcb@top@rule}]frame.north east);
+    \fi%
+    \ifcase\tcb@segment@state
+      \path[fill=white,draw,dotted]
+        ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]interior.south west) rectangle
+        ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]interior.north east);
+      \path[fill=green!20!white,draw=green!75!black,dashed]
+        ([xshift={\kvtcb@boxsep+\kvtcb@leftupper},yshift={\kvtcb@boxsep+\kvtcb@bottom}]interior.south west)
+        rectangle node[font=\scriptsize] {upper: w=\tcb@w@upper, h=\tcb@height@upper}
+        +(\tcb@w@upper,\tcb@height@upper);
+    \or%
+      \ifvoid\tcb@upperbox
+        \path[fill=white,draw,dotted]
+          ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]interior.south west) rectangle
+          ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]interior.north east);
+      \else
+        \path[fill=white,draw,dotted]
+          ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]interior.south west) rectangle
+          ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]segmentation.east);
+        \path[fill=white,draw,dotted]
+           ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]segmentation.west)
+           rectangle ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]interior.north east);
+        \path[fill=green!20!white,draw=green!75!black,dashed]
+          ([xshift={\kvtcb@boxsep+\kvtcb@leftupper},yshift={\kvtcb@boxsep}]segmentation.north west)
+           rectangle node[font=\scriptsize] {upper: w=\tcb@w@upper, h=\tcb@height@upper}
+           +(\tcb@w@upper,\tcb@height@upper);
+      \fi%
+      \path[fill=green!20!white,draw=green!75!black,dashed]
+        ([xshift={\kvtcb@boxsep+\kvtcb@leftlower},yshift={\kvtcb@boxsep+\kvtcb@bottom}]interior.south west)
+        rectangle  node[font=\scriptsize] {lower: w=\tcb@w@lower, h=\tcb@height@lower}
+        +(\tcb@w@lower,\tcb@height@lower);
+      \path[draw=red,opacity=0.5] (segmentation.south west) rectangle (segmentation.north east);
+    \else
+      \path[fill=white,draw,dotted]
+        ([xshift={\kvtcb@boxsep},yshift={\kvtcb@boxsep}]interior.south west) rectangle
+        ([xshift={-\kvtcb@boxsep},yshift={-\kvtcb@boxsep}]interior.north east);
+      \path[fill=green!20!white,draw=green!75!black,dashed]
+        ([xshift={\kvtcb@boxsep+\kvtcb@leftlower},yshift={\kvtcb@boxsep+\kvtcb@bottom}]interior.south west)
+        rectangle  node[font=\scriptsize] {lower: w=\tcb@height@lower, h=\tcb@h@lower}
+        +(\tcb@w@lower,\tcb@height@lower);
+    \fi%
+    \path[draw=red,opacity=0.5] (interior.south west) rectangle (interior.north east);
+    \path[draw=red,opacity=0.5] (frame.south west) rectangle (frame.north east);
+    \node[above,font=\scriptsize,red!50!black] at (interior.south) {interior: w=\tcb@innerwidth, h=\tcb@innerheight};
+    \node[above,font=\scriptsize,red!50!black] at (frame.north) {frame: w=\the\dimexpr\kvtcb@width\relax, h=\tcb@height};
+    \path[draw=blue!10!white,double,line width=1pt,dashed,opacity=0.3] (current bounding box.south west) rectangle (current bounding box.north east);
+    \pgfsetfillopacity{0.3}
+  },
+  interior titled code=,interior code=,overlay=,},
+  draft/.style={skin=draft}}
+
+
+\newbox\tcb@waterbox
+
+\def\tcb@setratio#1#2#3{\edef#1{\strip@pt\dimexpr\number\numexpr\number\dimexpr#2\relax*65536/\number\dimexpr#3\relax\relax sp\relax}}
+
+\def\tcb@setratiorobust#1#2#3{\ifdim\dimexpr#3<1pt\tcb@setratio#1{#2}{1pt}\else\tcb@setratio#1{#2}{#3}\fi}
+
+\def\tcb@comp@wm@stretch{%
+  \tcb@setratiorobust\tcb@scale@x{\dimexpr\kvtcb@watermark@factor\dimexpr\tcb@innerwidth\relax\relax}{\wd\tcb@waterbox}%
+  \tcb@setratiorobust\tcb@scale@y{\dimexpr\kvtcb@watermark@factor\dimexpr\tcb@innerheight\relax\relax}{\ht\tcb@waterbox+\dp\tcb@waterbox}%
+}
+
+\def\tcb@comp@wm@zoom{%
+  \tcb@setratiorobust\tcb@scale@x{\dimexpr\kvtcb@watermark@factor\dimexpr\tcb@innerwidth\relax\relax}{\wd\tcb@waterbox}%
+  \tcb@setratiorobust\tcb@scale@y{\dimexpr\kvtcb@watermark@factor\dimexpr\tcb@innerheight\relax\relax}{\ht\tcb@waterbox+\dp\tcb@waterbox}%
+  \ifdim\dimexpr\tcb@scale@x pt\relax<\dimexpr\tcb@scale@y pt\relax\let\tcb@scale@y=\tcb@scale@x\else\let\tcb@scale@x=\tcb@scale@y\fi%
+}
+
+\def\tcb@drawspec@watermark{%
+  \tcb@comp@wm%
+  \node[opacity=\kvtcb@watermark@opacity,anchor=center] at (interior) {\scalebox{\tcb@scale@x}[\tcb@scale@y]{\box\tcb@waterbox}};%
+}
+
+\def\tcb@drawspec@watermark@tikz#1{%
+  \setbox\tcb@waterbox=\hbox{\pgfinterruptpicture{\begin{tikzpicture}[color=\kvtcb@watermark@color]#1\end{tikzpicture}}\endpgfinterruptpicture}%
+  \tcb@drawspec@watermark%
+}
+
+\def\tcb@drawspec@watermark@graphics#1{%
+  \setbox\tcb@waterbox=\hbox{\pgfinterruptpicture{\includegraphics{#1}}\endpgfinterruptpicture}%
+  \tcb@drawspec@watermark%
+}
+
+\def\tcb@drawspec@watermark@text#1{%
+  \tcb@drawspec@watermark@tikz{\node[inner sep=0pt,align=flush center]{#1};}%
+}
+
+\tcbset{%
+  watermark opacity/.store in=\kvtcb@watermark@opacity,%
+  watermark color/.store in=\kvtcb@watermark@color,%
+  watermark zoom/.code={\def\kvtcb@watermark@factor{#1}\let\tcb@comp@wm=\tcb@comp@wm@zoom},%
+  watermark stretch/.code={\def\kvtcb@watermark@factor{#1}\let\tcb@comp@wm=\tcb@comp@wm@stretch},%
+%
+  watermark tikz/.style={overlay={\tcb@drawspec@watermark@tikz{#1}}},
+  watermark tikz on/.style args={#1 is #2}{overlay #1={\tcb@drawspec@watermark@tikz{#2}}},%
+  watermark graphics/.style={overlay={\tcb@drawspec@watermark@graphics{#1}}},
+  watermark graphics on/.style args={#1 is #2}{overlay #1={\tcb@drawspec@watermark@graphics{#2}}},
+  watermark text/.style={overlay={\tcb@drawspec@watermark@text{#1}}},
+  watermark text on/.style args={#1 is #2}{overlay #1={\tcb@drawspec@watermark@text{#2}}},
+  no watermark/.style={no overlay},
+  %
+  watermark opacity=1.00,
+  watermark color=\kvtcb@colback!85!\kvtcb@colframe,
+  watermark zoom=0.75,
+}
+
+
+\tcbset{marker/.style={%
+  skin=enhancedmiddle,
+  breakable,parbox=false,
+  boxrule=0mm,leftrule=5mm,rightrule=5mm,boxsep=0mm,
+  left=3mm,right=3mm,top=1mm,bottom=1mm,
+  toptitle=1mm,bottomtitle=1mm,fonttitle=\bfseries,
+  arc=0mm,outer arc=0mm,
+  colback=yellow!10!white,colframe=red,
+  watermark color=yellow!75!red!25!white,
+  enlarge left by=-8mm,
+  enlarge right by=-8mm,
+  enlarge top by=0mm,
+  enlarge bottom by=0mm,
+  width=\the\dimexpr\linewidth+1.6cm\relax,
+  frame style={top color=\kvtcb@colframe,bottom color=\kvtcb@colframe,middle color=yellow!75!\kvtcb@colframe},
+  title style={left color=\kvtcb@colframe,right color=\kvtcb@colframe,middle color=yellow!75!\kvtcb@colframe},
+  watermark tikz={\draw[line width=2mm] (interior) circle (1cm) node{\fontfamily{ptm}\fontseries{b}\fontsize{20mm}{20mm}\selectfont!};},
+  watermark zoom=0.75,
 }}
 
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcbtheorems.code.tex b/Master/texmf-dist/tex/latex/tcolorbox/tcbtheorems.code.tex
index 3df36745355..1485b58a9fe 100644
--- a/Master/texmf-dist/tex/latex/tcolorbox/tcbtheorems.code.tex
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcbtheorems.code.tex
@@ -1,4 +1,4 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcbtheorems.code.tex: Code for theorems in colorboxes
 %%
 %% -------------------------------------------------------------------------------------------
@@ -23,7 +23,7 @@
 \tcbset{
   theorem/.code args={#1#2#3#4}{%
   \refstepcounter{#2}\label{#4}%
-  \pgfkeysalso{title={\setlength{\hangindent}{\widthof{#1~\csname the#2\endcsname:\ }}\hangafter=1 \mbox{#1~\csname the#2\endcsname:\ }#3}}}%
+  \pgfkeysalso{title={\setbox\z@=\hbox{#1~\csname the#2\endcsname:\ }\hangindent\wd\z@\hangafter=1 \mbox{#1~\csname the#2\endcsname:\ }#3}}}%
 }
 
 \newcommand{\tcbmaketheorem}[5]{%
diff --git a/Master/texmf-dist/tex/latex/tcolorbox/tcolorbox.sty b/Master/texmf-dist/tex/latex/tcolorbox/tcolorbox.sty
index e776c56bf1b..b9f4b18b411 100644
--- a/Master/texmf-dist/tex/latex/tcolorbox/tcolorbox.sty
+++ b/Master/texmf-dist/tex/latex/tcolorbox/tcolorbox.sty
@@ -1,8 +1,8 @@
-%% The LaTeX package tcolorbox - version 1.30 (2012/04/20)
+%% The LaTeX package tcolorbox - version 2.00 (2013/03/01)
 %% tcolorbox.sty: Text color boxes
 %%
 %% -------------------------------------------------------------------------------------------
-%% Copyright (c) 2006-2012 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
+%% Copyright (c) 2006-2013 by Prof. Dr. Dr. Thomas F. Sturm <thomas dot sturm at unibw dot de>
 %% -------------------------------------------------------------------------------------------
 %%
 %% This work may be distributed and/or modified under the
@@ -18,10 +18,9 @@
 %% This work consists of all files listed in README
 %%
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{tcolorbox}[2012/04/20 version 1.30 text color boxes]
+\ProvidesPackage{tcolorbox}[2013/03/01 version 2.00 text color boxes]
 
 \RequirePackage{pgf}[2008/01/15]
-\RequirePackage{calc}[2007/08/22]
 \RequirePackage{verbatim}[2003/08/22]
 
 % register
@@ -31,25 +30,66 @@
 \newif\iftcb@hasLower
 \newif\iftcb@lowerspace
 
-\newsavebox{\tcb@titlebox}
-\newsavebox{\tcb@upperbox}
-\newsavebox{\tcb@lowerbox}
-
-\newlength\tcb@textdim
+\newbox\tcb@titlebox
+\newbox\tcb@upperbox
+\newbox\tcb@lowerbox
 
+\newcounter{tcbbreakpart}
 
 % key management
 \pgfkeys{/tcb/.is family}
 
 \def\tcbset{\pgfqkeys{/tcb}}
 
+\def\tcbdimto#1#2{\edef#1{\the\dimexpr#2\relax}}
+
+\def\tcb@comp@arc@auto{%
+  \let\tcb@outer@arc=\kvtcb@top@rule@stand%
+  \ifdim\kvtcb@bottom@rule@stand<\tcb@outer@arc\relax%
+    \let\tcb@outer@arc=\kvtcb@bottom@rule@stand\fi%
+  \ifdim\kvtcb@left@rule<\tcb@outer@arc\relax%
+    \let\tcb@outer@arc=\kvtcb@left@rule\fi%
+  \ifdim\kvtcb@right@rule<\tcb@outer@arc\relax%
+    \let\tcb@outer@arc=\kvtcb@right@rule\fi%
+  \tcbdimto\tcb@outer@arc{\tcb@outer@arc+\kvtcb@arc}%
+}
+
+\def\tcb@comp@arc@fix{%
+  \let\tcb@outer@arc=\kvtcb@outerarc%
+}
+
 \tcbset{
   title/.store in=\kvtcb@title,
   notitle/.style={title=},
-  adjusted title/.style={title={\rule[0mm-\depthof{pgjy}]{0mm}{\depthof{pgjy}+\heightof{\"A}}#1}},
+  adjust text/.store in=\kvtcb@adjusttext,
+  adjusted title/.style={title={#1\vphantom{\kvtcb@adjusttext}}},
   width/.store in=\kvtcb@width,
   boxsep/.store in=\kvtcb@boxsep,
-  boxrule/.store in=\kvtcb@boxrule,
+  toprule at break/.store in=\kvtcb@top@rule@break,
+  toprule/.code={%
+    \def\kvtcb@top@rule@stand{#1}%
+    \let\kvtcb@top@rule@break=\kvtcb@top@rule@stand%
+    },
+  bottomrule at break/.store in=\kvtcb@bottom@rule@break,
+  bottomrule/.code={%
+    \def\kvtcb@bottom@rule@stand{#1}%
+    \let\kvtcb@bottom@rule@break=\kvtcb@bottom@rule@stand%
+    },
+  leftrule/.store in=\kvtcb@left@rule,
+  rightrule/.store in=\kvtcb@right@rule,
+  titlerule/.store in=\kvtcb@title@rule,
+  boxrule/.code={
+    \def\kvtcb@top@rule@stand{#1}%
+    \let\kvtcb@top@rule@break=\kvtcb@top@rule@stand%
+    \let\kvtcb@bottom@rule@stand=\kvtcb@top@rule@stand%
+    \let\kvtcb@bottom@rule@break=\kvtcb@top@rule@stand%
+    \let\kvtcb@left@rule=\kvtcb@top@rule@stand%
+    \let\kvtcb@right@rule=\kvtcb@top@rule@stand%
+    \let\kvtcb@title@rule=\kvtcb@top@rule@stand%
+    },
+  arc/.store in=\kvtcb@arc,
+  outer arc/.code={\def\kvtcb@outerarc{#1}\let\tcb@comp@arc=\tcb@comp@arc@fix},
+  auto outer arc/.code={\let\tcb@comp@arc=\tcb@comp@arc@auto},
   lefttitle/.store in=\kvtcb@lefttitle,
   leftupper/.store in=\kvtcb@leftupper,
   leftlower/.store in=\kvtcb@leftlower,
@@ -59,9 +99,10 @@
   rightlower/.store in=\kvtcb@rightlower,
   right/.style={righttitle=#1,rightupper=#1,rightlower=#1},
   top/.store in=\kvtcb@top,
+  toptitle/.store in=\kvtcb@toptitle,
   bottom/.store in=\kvtcb@bottom,
+  bottomtitle/.store in=\kvtcb@bottomtitle,
   middle/.store in=\kvtcb@middle,
-  arc/.store in=\kvtcb@arc,
   colback/.store in=\kvtcb@colback,
   colframe/.store in=\kvtcb@colframe,
   colupper/.store in=\kvtcb@colupper,
@@ -97,9 +138,16 @@
   split/.code={\def\tcb@height@fraction{#1}\let\tcb@ch@fixed@both=\tcb@ch@fixed@split},
   valign/.store in=\kvtcb@valign,
   valign lower/.store in=\kvtcb@valignlower,
-  %skin/.store in=\kvtcb@skin,
-  enlarge top by/.store in=\kvtcb@bbtop,
-  enlarge bottom by/.store in=\kvtcb@bbbottom,
+  enlarge top at break by/.store in=\kvtcb@bbtop@break,
+  enlarge top by/.code={%
+    \def\kvtcb@bbtop@stand{#1}%
+    \let\kvtcb@bbtop@break=\kvtcb@bbtop@stand%
+    },
+  enlarge bottom at break by/.store in=\kvtcb@bbbottom@break,
+  enlarge bottom by/.code={%
+    \def\kvtcb@bbbottom@stand{#1}%
+    \let\kvtcb@bbbottom@break=\kvtcb@bbbottom@stand%
+    },
   enlarge left by/.store in=\kvtcb@bbleft,
   enlarge right by/.store in=\kvtcb@bbright,
   toggle enlargement/.store in=\kvtcb@bbtoggle,
@@ -108,24 +156,59 @@
   interior titled engine/.store in=\kvtcb@engine@interiortitled,
   interior engine/.store in=\kvtcb@engine@interior,
   segmentation engine/.store in=\kvtcb@engine@segmentation,
+  title engine/.store in=\kvtcb@engine@title,
   geometry nodes/.store in=\kvtcv@geonodes,
   geometry nodes/.default=true,%
+  skin first/.store in=\kvtcb@skin@first,
+  skin middle/.store in=\kvtcb@skin@middle,
+  skin last/.store in=\kvtcb@skin@last,
   skin@standard/.style={frame engine=standard,interior titled engine=standard,
-    interior engine=standard,segmentation engine=standard,graphical environment=pgfpicture,
-    geometry nodes=false},
+    interior engine=standard,segmentation engine=standard,title engine=standard,
+    graphical environment=pgfpicture,
+    geometry nodes=false,skin first=standard,skin middle=standard,skin last=standard},
   skin/.style={skin@#1},
+  parbox/.store in=\kvtcv@parbox,
+  parbox/.default=true,%
+  overlay unbroken/.code={\def\tcb@overlay@unbroken{#1}},%
+  overlay first/.code={\def\tcb@overlay@first{#1}},%
+  overlay middle/.code={\def\tcb@overlay@middle{#1}},%
+  overlay last/.code={\def\tcb@overlay@last{#1}},%
+  overlay/.code={\def\tcb@overlay@temp{#1}%
+    \let\tcb@overlay@unbroken=\tcb@overlay@temp%
+    \let\tcb@overlay@first=\tcb@overlay@temp%
+    \let\tcb@overlay@middle=\tcb@overlay@temp%
+    \let\tcb@overlay@last=\tcb@overlay@temp},%
+  overlay broken/.code={\def\tcb@overlay@temp{#1}%
+    \let\tcb@overlay@first=\tcb@overlay@temp%
+    \let\tcb@overlay@middle=\tcb@overlay@temp%
+    \let\tcb@overlay@last=\tcb@overlay@temp},%
+  overlay unbroken and first/.code={\def\tcb@overlay@temp{#1}%
+    \let\tcb@overlay@unbroken=\tcb@overlay@temp%
+    \let\tcb@overlay@first=\tcb@overlay@temp},%
+  overlay middle and last/.code={\def\tcb@overlay@temp{#1}%
+    \let\tcb@overlay@middle=\tcb@overlay@temp%
+    \let\tcb@overlay@last=\tcb@overlay@temp},%
+  no overlay/.style={overlay=},%
+  standard/.style={skin=standard},%
 }
 
-\tcbset{notitle,width=\linewidth,boxsep=1mm,boxrule=0.5mm,
+\tcbset{notitle,width=\linewidth,boxsep=1mm,boxrule=0.5mm,adjust text={\"Apgjy},
   left=4mm,right=4mm,top=2mm,bottom=2mm,middle=2mm,arc=1mm,lowerbox=visible,
   colback=black!5!white,colframe=black!75!white,coltext=black,coltitle=white,
   fonttitle=,fontupper=,fontlower=,floatplacement=htb,nofloat,savelowerto=,
   parskip,savedelimiter={tcolorbox},tempfile={\jobname.tcbtemp},
   enlarge top by=0mm,enlarge bottom by=0mm,enlarge left by=0mm,enlarge right by=0mm,
-  toggle enlargement=none,
-  skin=standard,
+  toggle enlargement=none,toptitle=0mm,bottomtitle=0mm,
+  standard,parbox,overlay=,auto outer arc,
 }%
 
+\let\tcb@parboxrestore=\@parboxrestore
+
+\def\tcb@parbox@use@false{%
+  \def\@parboxrestore{\leavevmode\let\@parboxrestore=\tcb@parboxrestore}%
+}
+
+\let\tcb@parbox@use@true\relax%
 
 % lrbox with integrated minipage
 \def\tcb@lrbox#1#2{%
@@ -133,19 +216,23 @@
     \endgroup
     \setbox#1\hbox{%
       \begingroup\aftergroup}%
-        \def\noexpand\@currenvir{\@currenvir}%
-        \def\noexpand\@currenvline{\on@line}}%
+    \def\noexpand\@currenvir{\@currenvir}%
+    \def\noexpand\@currenvline{\on@line}}%
   \reserved@a
     \@endpefalse
-    \color@setgroup
-      \ignorespaces\minipage#2\ignorespaces}
-\def\endtcb@lrbox{\unskip\endminipage\unskip\color@endgroup}
+    \begingroup%
+    \csname tcb@parbox@use@\kvtcv@parbox\endcsname%
+    \ignorespaces\minipage#2\ignorespaces}
+\def\endtcb@lrbox{\unskip\endminipage\unskip\endgroup}
+
+\let\tcb@savebox=\tcb@lrbox
+\let\endtcb@savebox=\endtcb@lrbox
 
 \def\tcb@saveupperbox{%
-\begin{tcb@lrbox}{\tcb@upperbox}{\tcb@widthupper}\color{\kvtcb@colupper}\kvtcb@fontupper\ignorespaces}
+\begin{tcb@savebox}{\tcb@upperbox}{\tcb@w@upper}\color{\kvtcb@colupper}\kvtcb@fontupper\ignorespaces}
 
 \def\tcb@savelowerbox{%
-\begin{tcb@lrbox}{\tcb@lowerbox}{\tcb@widthlower}\color{\kvtcb@collower}\kvtcb@fontlower\ignorespaces}
+\begin{tcb@savebox}{\tcb@lowerbox}{\tcb@w@lower}\color{\kvtcb@collower}\kvtcb@fontlower\ignorespaces}
 
 
 % counter for float
@@ -165,28 +252,25 @@
   \tcbset{#1}%
   \tcb@hasLowerfalse%
   % computation of text width
-  \setlength{\tcb@textdim}{\kvtcb@width-\kvtcb@boxsep*2-\kvtcb@boxrule*2}%
-  \edef\tcb@innerwidth{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\tcb@innerwidth-\kvtcb@leftupper-\kvtcb@rightupper}%
-  \edef\tcb@widthupper{\the\tcb@textdim}%
+  \tcbdimto\tcb@innerwidth{\kvtcb@width-\kvtcb@left@rule-\kvtcb@right@rule}%
+  \tcbdimto\tcb@temp{\tcb@innerwidth-\kvtcb@boxsep*2}%
+  \tcbdimto\tcb@w@upper{\tcb@temp-\kvtcb@leftupper-\kvtcb@rightupper}%
   \ifx\kvtcb@title\@empty\tcb@hasTitlefalse\else%
     \tcb@hasTitletrue%
-    \setlength{\tcb@textdim}{\tcb@innerwidth-\kvtcb@lefttitle-\kvtcb@righttitle}%
-    \edef\tcb@widthtitle{\the\tcb@textdim}%
-    \begin{tcb@lrbox}{\tcb@titlebox}{\tcb@widthtitle}\color{\kvtcb@coltitle}\kvtcb@fonttitle\kvtcb@title\end{tcb@lrbox}%
+    \tcbdimto\tcb@w@title{\tcb@temp-\kvtcb@lefttitle-\kvtcb@righttitle}%
+    \begin{tcb@savebox}{\tcb@titlebox}{\tcb@w@title}\color{\kvtcb@coltitle}\kvtcb@fonttitle\kvtcb@title\end{tcb@savebox}%
   \fi%
   % switch for lower box
   \def\tcblower{%
-    \end{tcb@lrbox}%
-    \setlength{\tcb@textdim}{\tcb@innerwidth-\kvtcb@leftlower-\kvtcb@rightlower}%
-    \edef\tcb@widthlower{\the\tcb@textdim}%
+    \end{tcb@savebox}%
+    \tcbdimto\tcb@w@lower{\tcb@temp-\kvtcb@leftlower-\kvtcb@rightlower}%
     \tcb@hasLowertrue%
     \ifx\kvtcb@savelowerto\@empty%
       \let\tcb@startbox\tcb@savelowerbox%
       \let\endtcolorbox\tcb@endboxanddraw%
     \else%
       \IfFileExists{\kvtcb@savelowerto}{%
-        \tcb@savelowerbox\input{\kvtcb@savelowerto}\end{tcb@lrbox}}{}%
+        \tcb@savelowerbox\input{\kvtcb@savelowerto}\end{tcb@savebox}}{}%
       \let\tcb@startbox\tcb@lowerverbatim%
       \expandafter\let\csname end\kvtcb@savedelimiter\expandafter\endcsname\csname tcb@endlowerverbatimanddraw\endcsname%
     \fi%
@@ -199,8 +283,8 @@
 \let\tcolorbox\tcb@colorbox
 
 \def\tcb@endboxanddraw{%
-  \end{tcb@lrbox}%
-  \tcb@drawcolorbox%
+  \end{tcb@savebox}%
+  \tcb@draw@color@box%
 }
 
 \let\endtcolorbox=\tcb@endboxanddraw
@@ -208,37 +292,27 @@
 % height computations
 \def\tcb@ch@natural{%
   \edef\tcb@height{\tcb@natheight}%
-  \setlength{\tcb@textdim}{\ht\tcb@upperbox+\dp\tcb@upperbox}%
-  \edef\tcb@height@upper{\the\tcb@textdim}%
+  \tcbdimto\tcb@height@upper{\ht\tcb@upperbox+\dp\tcb@upperbox}%
   \iftcb@lowerspace%
-  \setlength{\tcb@textdim}{\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
-  \edef\tcb@height@lower{\the\tcb@textdim}%
+  \tcbdimto\tcb@height@lower{\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
   \fi%
 }
 
 \def\tcb@ch@fixed@upper{%
-  \setlength{\tcb@textdim}{\ht\tcb@upperbox+\dp\tcb@upperbox+\tcb@height-\tcb@natheight}%
-  \edef\tcb@height@upper{\the\tcb@textdim}%
+  \tcbdimto\tcb@height@upper{\ht\tcb@upperbox+\dp\tcb@upperbox+\tcb@height-\tcb@natheight}%
 }
 
 \def\tcb@ch@fixed@space{%
-  \setlength{\tcb@textdim}{\tcb@height-\tcb@natheight}%
-  \edef\tcb@height@space{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\tcb@height@space*\real{\tcb@height@fraction}}%
-  \edef\tcb@height@spaceupper{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\ht\tcb@upperbox+\dp\tcb@upperbox+\tcb@height@spaceupper}%
-  \edef\tcb@height@upper{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\ht\tcb@lowerbox+\dp\tcb@lowerbox+\tcb@height@space-\tcb@height@spaceupper}%
-  \edef\tcb@height@lower{\the\tcb@textdim}%
+  \tcbdimto\tcb@height@space{\tcb@height-\tcb@natheight}%
+  \tcbdimto\tcb@height@spaceupper{\tcb@height@fraction\dimexpr\tcb@height@space\relax}%
+  \tcbdimto\tcb@height@upper{\ht\tcb@upperbox+\dp\tcb@upperbox+\tcb@height@spaceupper}%
+  \tcbdimto\tcb@height@lower{\ht\tcb@lowerbox+\dp\tcb@lowerbox+\tcb@height@space-\tcb@height@spaceupper}%
 }
 
 \def\tcb@ch@fixed@split{%
-  \setlength{\tcb@textdim}{\tcb@height-\tcb@natheight+\ht\tcb@upperbox+\dp\tcb@upperbox+\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
-  \edef\tcb@height@space{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\tcb@height@space*\real{\tcb@height@fraction}}%
-  \edef\tcb@height@upper{\the\tcb@textdim}%
-  \setlength{\tcb@textdim}{\tcb@height@space-\tcb@height@upper}%
-  \edef\tcb@height@lower{\the\tcb@textdim}%
+  \tcbdimto\tcb@height@space{\tcb@height-\tcb@natheight+\ht\tcb@upperbox+\dp\tcb@upperbox+\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
+  \tcbdimto\tcb@height@upper{\tcb@height@fraction\dimexpr\tcb@height@space\relax}%
+  \tcbdimto\tcb@height@lower{\tcb@height@space-\tcb@height@upper}%
 }
 
 \def\tcb@ch@fixed{%
@@ -271,18 +345,18 @@
   \iftcb@lowerspace\tcb@ch@fixed@both\else\tcb@ch@fixed@upper\fi%
 }
 
-\def\tcb@dbox@top#1#2#3#4{\pgftext[x=#1,y=#2+#3,left,top]{\usebox{#4}}}%
+\def\tcb@dbox@top#1#2#3#4{\pgftext[x=#1,y=#2+#3,left,top]{\box#4}}%
 
-\def\tcb@dbox@bottom#1#2#3#4{\pgftext[x=#1,y=#2,left,bottom]{\usebox{#4}}}%
+\def\tcb@dbox@bottom#1#2#3#4{\pgftext[x=#1,y=#2,left,bottom]{\box#4}}%
 
-\def\tcb@dbox@center#1#2#3#4{\pgftext[x=#1,y=#2+#3/2,left]{\usebox{#4}}}%
+\def\tcb@dbox@center#1#2#3#4{\pgftext[x=#1,y=#2+#3/2,left]{\box#4}}%
 
 \tcbset{natural height,space to lower,valign=top,valign lower=top}
 
 % fill frame
 \def\tcb@drawframe@standard{%
   \begin{pgfscope}%
-  \pgfsetcornersarced{\pgfpoint{\kvtcb@arc+\kvtcb@boxrule}{\kvtcb@arc+\kvtcb@boxrule}}%
+  \pgfsetcornersarced{\pgfpoint{\tcb@outer@arc}{\tcb@outer@arc}}%
   \pgfsetfillcolor{\kvtcb@colframe}%
   \pgfpathrectangle{\pgfpoint{0mm}{0mm}}{\pgfpoint{\kvtcb@width}{\tcb@height}}%
   \pgfusepath{fill}%
@@ -293,12 +367,12 @@
 \def\tcb@drawwithtitle@standard{%
   \begin{pgfscope}%
   \pgfsetcornersarced{\pgfpoint{0mm}{0mm}}%
-  \pgfmoveto{\pgfpoint{\kvtcb@boxrule}{\kvtcb@boxrule}}%
-  \pgflineto{\pgfpoint{\kvtcb@boxrule}{\kvtcb@boxrule+\tcb@innerheight}}%
-  \pgflineto{\pgfpoint{\kvtcb@width-\kvtcb@boxrule}{\kvtcb@boxrule+\tcb@innerheight}}%
+  \pgfmoveto{\pgfpoint{\kvtcb@left@rule}{\kvtcb@bottom@rule}}%
+  \pgflineto{\pgfpoint{\kvtcb@left@rule}{\kvtcb@bottom@rule+\tcb@innerheight}}%
+  \pgflineto{\pgfpoint{\kvtcb@width-\kvtcb@right@rule}{\kvtcb@bottom@rule+\tcb@innerheight}}%
   \pgfsetcornersarced{\pgfpoint{\kvtcb@arc}{\kvtcb@arc}}%
-  \pgflineto{\pgfpoint{\kvtcb@width-\kvtcb@boxrule}{\kvtcb@boxrule}}%
-  \pgflineto{\pgfpoint{\kvtcb@boxrule}{\kvtcb@boxrule}}%
+  \pgflineto{\pgfpoint{\kvtcb@width-\kvtcb@right@rule}{\kvtcb@bottom@rule}}%
+  \pgflineto{\pgfpoint{\kvtcb@left@rule}{\kvtcb@bottom@rule}}%
   \pgfpathclose%
   \pgfsetfillcolor{\kvtcb@colback}%
   \pgfusepath{fill}%
@@ -310,8 +384,8 @@
   \begin{pgfscope}%
   \pgfsetcornersarced{\pgfpoint{\kvtcb@arc}{\kvtcb@arc}}%
   \pgfsetfillcolor{\kvtcb@colback}%
-  \pgfpathrectangle{\pgfpoint{\kvtcb@boxrule}{\kvtcb@boxrule}}%
-    {\pgfpoint{\kvtcb@width-\kvtcb@boxrule*2}{\tcb@innerheight}}%
+  \pgfpathrectangle{\pgfpoint{\kvtcb@left@rule}{\kvtcb@bottom@rule}}%
+    {\pgfpoint{\kvtcb@width-\kvtcb@left@rule-\kvtcb@right@rule}{\tcb@innerheight}}%
   \pgfusepath{fill}%
   \end{pgfscope}%
 }
@@ -321,13 +395,16 @@
   \begin{pgfscope}%
   \pgfsetcolor{\kvtcb@colframe}%
   \pgfsetdash{{1mm}{1mm}}{0.5mm}%
-  \setlength{\tcb@textdim}{\kvtcb@boxrule+\kvtcb@boxsep*2+\kvtcb@middle+\kvtcb@bottom+\tcb@height@lower}%
-  \pgfpathmoveto{\pgfpoint{\kvtcb@boxrule}{\tcb@textdim}}%
-  \pgfpathlineto{\pgfpoint{\kvtcb@width-\kvtcb@boxrule}{\tcb@textdim}}%
+  \tcbdimto\tcb@seg@pos{\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@middle+\kvtcb@bottom+\tcb@height@lower}%
+  \pgfpathmoveto{\pgfpoint{\kvtcb@left@rule}{\tcb@seg@pos}}%
+  \pgfpathlineto{\pgfpoint{\kvtcb@width-\kvtcb@right@rule}{\tcb@seg@pos}}%
   \pgfusepath{stroke}%
   \end{pgfscope}%
 }
 
+% draw title box
+\def\tcb@drawtitle@standard{%
+}
 
 \def\tcb@setbb@toggle@none{%
   \pgfpathrectanglecorners{\pgfpoint{-\kvtcb@bbleft}{-\kvtcb@bbbottom}}%
@@ -345,7 +422,67 @@
 
 \def\tcb@creategeonodes@false{}
 
+\def\tcb@bbdraw{%
+  \csname tcb@setbb@toggle@\kvtcb@bbtoggle\endcsname%
+  \pgfusepath{use as bounding box}%
+  \csname tcb@creategeonodes@\kvtcv@geonodes\endcsname%
+}
+
+\def\tcb@tdraw@title{%
+  \iftcb@hasTitle%
+    \pgftext[x=\the\dimexpr\kvtcb@left@rule+\kvtcb@boxsep+\kvtcb@lefttitle\relax,
+             y=\the\dimexpr\tcb@height-\kvtcb@top@rule-\kvtcb@boxsep-\kvtcb@toptitle\relax,
+             left,top]{\usebox{\tcb@titlebox}}%
+  \fi%
+}
+
+\def\tcb@tdraw@upper{%
+  \csname tcb@dbox@\kvtcb@valign\endcsname{\the\dimexpr\kvtcb@left@rule+\kvtcb@boxsep+\kvtcb@leftupper\relax}%
+          {\the\dimexpr\tcb@innerheight+\kvtcb@bottom@rule-\kvtcb@boxsep-\kvtcb@top-\tcb@height@upper\relax}%
+          {\tcb@height@upper}{\tcb@upperbox}%
+}
+
+\def\tcb@tdraw@lower{%
+  \iftcb@lowervisible%
+    \csname tcb@dbox@\kvtcb@valignlower\endcsname{\the\dimexpr\kvtcb@left@rule+\kvtcb@boxsep+\kvtcb@leftlower\relax}%
+            {\the\dimexpr\kvtcb@bottom@rule+\kvtcb@boxsep+\kvtcb@bottom\relax}%
+            {\tcb@height@lower}{\tcb@lowerbox}%
+  \fi%
+}
+
+
+\def\tcb@draw@color@box{%
+  \tcb@comp@arc%
+  \iftcb@hasTitle%
+    \tcbdimto\tcb@h@title{\ht\tcb@titlebox+\dp\tcb@titlebox}%
+    \tcbdimto\tcb@h@padtitle{\kvtcb@title@rule+\kvtcb@boxsep*2+\kvtcb@toptitle+\kvtcb@bottomtitle+\tcb@h@title}%
+  \else%
+    \edef\tcb@h@title{0pt}%
+    \edef\tcb@h@padtitle{0pt}%
+  \fi%
+  %
+  \tcbdimto\tcb@h@upper{\ht\tcb@upperbox+\dp\tcb@upperbox}%
+  %
+  \iftcb@hasLower%
+  \iftcb@lowerignored\tcb@lowerspacefalse\else\tcb@lowerspacetrue\fi%
+  \else\tcb@lowerspacefalse\fi%
+  \iftcb@lowerspace%
+    \tcbdimto\tcb@h@segment{\kvtcb@boxsep*2+\kvtcb@middle*2}%
+    \tcbdimto\tcb@h@lower{\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
+  \else
+    \edef\tcb@h@segment{0pt}%
+    \edef\tcb@h@lower{0pt}%
+  \fi%
+  %
+  \tcb@drawcolorbox%
+}
+
+
 \def\tcb@drawcolorbox{%
+  \let\kvtcb@top@rule=\kvtcb@top@rule@stand%
+  \let\kvtcb@bottom@rule=\kvtcb@bottom@rule@stand%
+  \let\kvtcb@bbtop=\kvtcb@bbtop@stand%
+  \let\kvtcb@bbbottom=\kvtcb@bbbottom@stand%
   % floats
   \ifx\kvtcb@float\@empty%
   \newenvironment{tcb@float}{\kvtcb@beforebox}{\kvtcb@afterbox}%
@@ -353,29 +490,20 @@
     \edef\float@start{\noexpand\@float{tcbfloat}[\kvtcb@float]}%
     \newenvironment{tcb@float}{\float@start}{\end@float}%
   \fi%
-  \iftcb@hasLower%
-  \iftcb@lowerignored\tcb@lowerspacefalse\else\tcb@lowerspacetrue\fi%
-  \else\tcb@lowerspacefalse\fi%
+  \setcounter{tcbbreakpart}{1}%
   % computation of total height
-  \setlength{\tcb@textdim}{\kvtcb@boxrule*2+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom+\ht\tcb@upperbox+\dp\tcb@upperbox}%
-  \iftcb@hasTitle\addtolength{\tcb@textdim}{\kvtcb@boxrule+\kvtcb@boxsep*2+\ht\tcb@titlebox+\dp\tcb@titlebox}\fi%
+  \tcbdimto\tcb@natheight{\tcb@h@padtitle+\kvtcb@top@rule+\kvtcb@bottom@rule+\kvtcb@boxsep*2+\kvtcb@top+\kvtcb@bottom+\tcb@h@upper}%
   \iftcb@lowerspace%
-    \addtolength{\tcb@textdim}{\kvtcb@boxsep*2+\kvtcb@middle*2+\ht\tcb@lowerbox+\dp\tcb@lowerbox}%
-  \fi%
-  \edef\tcb@natheight{\the\tcb@textdim}%
-  \tcb@ch%
-  \iftcb@hasTitle%
-    \setlength{\tcb@textdim}{\tcb@height-\kvtcb@boxrule*3-\kvtcb@boxsep*2-\ht\tcb@titlebox-\dp\tcb@titlebox}%
-    \edef\tcb@innerheight{\the\tcb@textdim}%
+    \tcbdimto\tcb@natheight{\tcb@natheight+\tcb@h@segment+\tcb@h@lower}%
+    \def\tcb@segment@state{1}%
   \else%
-    \setlength{\tcb@textdim}{\tcb@height-\kvtcb@boxrule*2}%
-    \edef\tcb@innerheight{\the\tcb@textdim}%
+    \def\tcb@segment@state{0}%
   \fi%
+  \tcb@ch%
+  \tcbdimto\tcb@innerheight{\tcb@height-\kvtcb@top@rule-\kvtcb@bottom@rule-\tcb@h@padtitle}%
   \begin{tcb@float}\begin{\kvtcb@graphenv}%
-    \csname tcb@setbb@toggle@\kvtcb@bbtoggle\endcsname%
-    \pgfusepath{use as bounding box}%
-    \csname tcb@creategeonodes@\kvtcv@geonodes\endcsname%
-    % fill frame
+    \tcb@bbdraw%
+    % draw frame and interior
     \csname tcb@drawframe@\kvtcb@engine@frame\endcsname%
     \iftcb@hasTitle%
       \csname tcb@drawwithtitle@\kvtcb@engine@interiortitled\endcsname%
@@ -385,22 +513,14 @@
     \iftcb@lowerspace%
       \csname tcb@drawlower@\kvtcb@engine@segmentation\endcsname%
     \fi%
-    % set title
     \iftcb@hasTitle%
-      \setlength{\tcb@textdim}{\tcb@height-\kvtcb@boxrule-\kvtcb@boxsep}%
-      \pgftext[x=\kvtcb@boxrule+\kvtcb@boxsep+\kvtcb@lefttitle,
-               y=\tcb@textdim,left,top]{\usebox{\tcb@titlebox}}%
+      \csname tcb@drawtitle@\kvtcb@engine@title\endcsname%
     \fi%
-    % draw upper box
-    \csname tcb@dbox@\kvtcb@valign\endcsname{\kvtcb@boxrule+\kvtcb@boxsep+\kvtcb@leftupper}%
-            {\tcb@innerheight+\kvtcb@boxrule-\kvtcb@boxsep-\kvtcb@top-\tcb@height@upper}%
-            {\tcb@height@upper}{\tcb@upperbox}%
-    % draw lower box
-    \iftcb@hasLower\iftcb@lowervisible%
-      \csname tcb@dbox@\kvtcb@valignlower\endcsname{\kvtcb@boxrule+\kvtcb@boxsep+\kvtcb@leftlower}%
-              {\kvtcb@boxrule+\kvtcb@boxsep+\kvtcb@bottom}%
-              {\tcb@height@lower}{\tcb@lowerbox}%
-    \fi\fi%
+    \tcb@overlay@unbroken%
+    % draw text boxes
+    \tcb@tdraw@title%
+    \tcb@tdraw@upper%
+    \iftcb@hasLower\tcb@tdraw@lower\fi%
   \end{\kvtcb@graphenv}\end{tcb@float}%
 }
 
@@ -430,7 +550,7 @@
 
 \def\tcb@endlowerverbatimanddraw{%
   \tcb@endlowerverbatim%
-  \tcb@drawcolorbox%
+  \tcb@draw@color@box%
 }
 
 \def\tcb@lowerverbatim{%
@@ -467,6 +587,7 @@
 \tcb@add@library{theorems}{tcbtheorems.code.tex}
 \tcb@add@library{documentation}{tcbdocumentation.code.tex}
 \tcb@add@library{skins}{tcbskins.code.tex}
+\tcb@add@library{breakable}{tcbbreakable.code.tex}
 
 \ProcessOptions*
 \edef\tcb@temp{\noexpand\tcbuselibrary{\tcb@optionlist}}