The Editing team at the Wikimedia foundation is planning (in a quite long term future) to
cleanup some features of the wikitext markup language in order to be easier to parse and
more compatible with current standards like HTML 5. It will ease a lot the improvements of
some tools like the VisualEditor and Wsexport (the epub export tool).
The main project is to replace the current HTML cleanup software called Tidy that is very
outdated by a cleaner one that follows the HTML 5 specification. But it would requires to
fix some wiki pages to make sure that they keep being parsed well because the behaviour of
the cleaning tool is going to change for some edge cases.
An introduction and tools to update the wiki pages are available at  and more details
at . There is no hurry to update all pages soon but it would be nice to make sure that
the list of things to update will not grow in the future.