Last modified: 2014-05-23 05:38:38 UTC
The HTML tags checker is currently written in JavaScript. There should be a PHP implementation so that it works for users without JS and can be used for stuff like the API.
How does Parsoid handle invalid HTML?
I made a patch for this at https://gerrit.wikimedia.org/r/#/c/133675
Change 133675 merged by jenkins-bot: Add basic unclosed HTML tags checking in PHP https://gerrit.wikimedia.org/r/133675