Translations:Parsing/Replacing Tidy/FAQ/3/en

Tidy fixes these markup errors, but also does other "cleanup" on its own that is not required for correctness. For example, it removes empty elements and adds whitespace between HTML tags, which can sometimes change rendering. Since Tidy is based on HTML4 semantics and the web has moved to HTML5, it also makes some incorrect changes to HTML to 'fix' things that used to not work; for example, Tidy will unexpectedly move a bullet list out of a table caption even though that's allowed.