[wp-trac] [WordPress Trac] #45387: Valid HTML get mangled on the frontend

[WordPress Trac]

#45387: Valid HTML get mangled on the frontend
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 Reporter:  youknowriad   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by aduth):

 Maybe worth pointing out that the function is documented to have been
 slated for removal by v4.5.0 :

 https://core.trac.wordpress.org/browser/trunk/src/wp-
 includes/formatting.php?rev=43571#L687

 It's unclear from the history whether it's safe to be dropped without any
 additional changes.

 Related:

 - r34761
 - #34121
 - https://make.wordpress.org/core/2015/09/29/shortcode-roadmap-draft-two/

 I'm not certain whether this is on any person's radar for being addressed;
 my suspicion is it's not.

 For the regular expression itself, I sense it may not be possible in a
 single expression to match the end of an opening tag while exempting ">"
 which occur within an attribute value.

 It's unfortunate that this forces us into a position of
 [https://github.com/WordPress/gutenberg/pull/9963 needlessly escaping
 content], as it feels like compounding technical debt. The issue will
 remain for non-Gutenberg HTML entry.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45387#comment:6>
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