Hi,
Arlo and myself have been working on a new MediaWiki extension to expose
Parsoid's "lint errors" to users.
A little bit of background, Parsoid has a linter that identifies some
issues in wikitext that while may not result in user-facing errors, are
still not wanted in wikitext. An example might be
[[File:Example.png|foo|bar|baz]]. In this case, "foo" and "bar" are
ignored, and "baz" is the actual caption - but the bogus image options
should be removed. Other errors include missing end tags, obsolete HTML
tags, fostered content, etc.
The main advantage of this over tracking categories is that we know the
location in the wikitext so it should be easier to identify the error
and fix it, as well as knowing whether the issue was caused via a
template or not.
The main ticket tracking deployment is
<https://phabricator.wikimedia.org/T148609>.
-- Legoktm