[wp-trac] [WordPress Trac] #49424: Breaking change to DOM/CSS from #poststuff to .poststuff

[WordPress Trac]

#49424: Breaking change to DOM/CSS from #poststuff to .poststuff
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 Reporter:  elliotcondon  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 The element used to wrap admin page HTML has changed in WP 5.4 from `<div
 id="poststuff">` to `<div class="poststuff">`.

 This change will cause major issues for plugins and themes that include
 css/js relying on that well-established wrapping element to exist.

 Q1. Is it be possible to revert this change from class back to id?
 Q2. If the change must go ahead, can we retain backwards compatibility by
 also adding in the additional id attribute?

 Thanks,
 Elliot

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Ticket URL: <https://core.trac.wordpress.org/ticket/49424>
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