[wp-trac] [WordPress Trac] #45186: Admin notice jumps from above the H1 to below it when created.

[WordPress Trac]

#45186: Admin notice jumps from above the H1 to below it when created.
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 Reporter:  dschalk         |       Owner:  (none)
     Type:  defect (bug)    |      Status:  new
 Priority:  normal          |   Milestone:  7.0
Component:  Administration  |     Version:  2.7
 Severity:  normal          |  Resolution:
 Keywords:  needs-patch     |     Focuses:  ui, administration
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Comment (by codex-m):

 I've checked this, and it's possible to fix it by moving all processing to
 the server side. I've attached the patch to this. The best solution is to
 use the new `Dom\HTMLDocument` class which is now recommended for HTML
 processing. The current `WP_HTML_Tag_Processor` lacks all the methods for
 this processing.

 The only downside is that the new `Dom\HTMLDocument` class requires PHP
 8.4 or above. I've tried the legacy PHP `DOMDocument` (supported in older
 PHP versions). Still, since it uses an HTML 4 input parser, it is unstable
 and unreliable with WordPress 7.0's modern look.

 To test this patch, use PHP 8.4 or 8.5. All notices are moved after the
 admin pages' heading tags on the server-side (via output buffering). The
 visual glitch observed is no longer present (which was the main issue on
 this ticket).

 When the environment is using PHP 8.3 or earlier, the patch won't run and
 will revert to the backward-compatible JavaScript solution, as it was
 already implemented.

 I've tested this patch in many scenarios, including the default core
 settings pages, user edit pages, plugin settings pages, and multisite.
 More testing would be appreciated if we keep this up before the WordPress
 7.0 release.

 In the future, when PHP 8.4 becomes the WordPress minimum version
 standard, we can mark the JS code (on `common.js`) as deprecated and
 finally remove it.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/45186#comment:17>
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