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The LaTeX package 'lua-visual-debug' shows boxes, glues, kerns and
penalties in the PDF output.

Usage:

\usepackage{lua-visual-debug}

Requirements: The package only works with LuaLaTeX.
  With other engines, a warning message will be shown.

Copyright 2012 Patrick Gundlach (patrick@gundla.ch)
Public repository: https://github.com/pgundlach/lvdebug
Licensed under the MIT license. See the Lua file for details.
The idea is heavily inspired by Hans Hagen's http://pragma-ade.com/articles/art-visi.pdf