Debugging
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This is an update of Visual Debugging page (focused on the old ConTeXt version Mark II) for the current Mark XL (aka LMTX) version.
Code
\tracingall turns on all tracing. Put someplace near when you think the problem happens.
TeX
Lua
XML
Visuals
Fonts
\replacemissingcharacters will replace characters missing in the font(s) with squares respecting font switches (\it, \bf). Underneath the squares are wanted characters, so though invisible, one can still search (in searchable PDF editors) or copy them to the text editor to see the missing characters.