I reset the page but the HTML supplied to VE by Parsoid is broken:

http://parsoid-lb.eqiad.wikimedia.org/sewikimedia/N%C3%A4sta_dagordning?oldid=27867

Unsurprisingly, this round-trips poorly. :-(

Three different ways of handling the broken comment:

• PHP + Tidy combination seem to ignore --!> and extend the comment till it finds a --> .. but, this combination seems to be stripping out the comment till the closing "-->"
• Parsoid seems to be parsing this the same way, except that the comment is not stripped out and is left behind.
• Browsers seem to be quite liberal and accept the broken --!> as a closing comment tag which means everything after the --!> which Parsoid treated as part of a comment is rendered as plain text.

I dont think this is a high priority fix required in Parsoid. In Parsoid rendering, broken comments will become visible and are likely to get fixed up in wikitext. I think that is how it should be rather than add a bunch of hacks in Parsoid to handle this scenario.

I am inclined to mark this WONTFIX, but leaving this open in the low/minor category in case you see it differently.

The fix for this would be as indicated in the title. This would still dirty diff, but the behavior would be consistent with what the PHP+Tidy combination does and works around browser's leniency around broken comments.

Change 147051 had a related patch set uploaded by Arlolra:
Accept --!> as a comment closing tag

https://gerrit.wikimedia.org/r/147051

Change 147051 merged by jenkins-bot:
Suppress --!> as a comment closing tag in browsers

https://gerrit.wikimedia.org/r/147051