[wp-trac] [WordPress Trac] #27350: Invalid HTML Output

[WordPress Trac]

#27350: Invalid HTML Output
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 Reporter:  miqrogroove   |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Formatting    |     Version:  3.8
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by bcworkz):

 Yes, it is `wpautop()` wreaking havoc. FWIW, one way to prevent it is to
 switch to the visual tab, which inserts a huge amount of white space. The
 extra white space, while being offensive to those that hand code HTML,
 does allow `wpautop()` to work correctly.

 I've traced the problem to the block of code starting at line 265 of wp-
 includes/formatting.php. The block starting with:
 {{{
 $pee = preg_replace('|<p>\s*</p>|', '', $pee); // under certain strange
 conditions it could create a P of entirely whitespace
 }}}
 I've no idea how to correct for the errors though without potentially
 messing up other HTML.

 The function essentially adds opening and closing P tags at the front and
 end of every line, then removes those tags not adjacent to multiple
 newlines. However, there's a slew of regexp replacements to account for
 special situations which makes the whole thing very complex and prone to
 unanticipated errors like you've found..

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Ticket URL: <https://core.trac.wordpress.org/ticket/27350#comment:3>
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