[wp-trac] [WordPress Trac] #57322: Twenty Twenty-Three: Gradients clear upon saving when KSES filters are active

[WordPress Trac]

#57322: Twenty Twenty-Three: Gradients clear upon saving when KSES filters are
active
---------------------------+-----------------------------
 Reporter:  mmtr86         |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Bundled Theme  |    Version:
 Severity:  normal         |   Keywords:
  Focuses:                 |
---------------------------+-----------------------------
 The Twenty Twenty-Three theme has some style variations that include a
 background gradient such as Pilgrimage or Sherbet.

 When the KSES filters (*) are active, the background gradient gets cleared
 because the CSS value doesn't match
 [[https://core.trac.wordpress.org/browser/trunk/src/wp-
 includes/kses.php?rev=54933#L2533|this regex]] (see
 https://regex101.com/r/awcZif/1).

 (*) These filters are only registered when a user doesn't have the
 `unfiltered_html` capability (which is the case for
 [[https://core.trac.wordpress.org/browser/tags/6.1/src/wp-
 includes/capabilities.php?marks=591,592#L591|multisite regular admins]]),
 but can be manually enabled with `add_action( 'init', 'kses_init_filters'
 )`.


 ----


 **Steps to reproduce**

 - Enable the KSES filters with `add_action( 'init', 'kses_init_filters'
 );`
 - Activate the Twenty Twenty-Three theme
 - Go to Appearance > Editor
 - Open the Styles sidebar
 - Click on "Browse styles"
 - Choose the Pilgrimage or Sherbet variation
 - See the background gradient applied in the preview (dotted background
 for Pilgrimage, rainbow gradient for Sherbet)
 - Save the changes
 - ⚠️ Note how the gradient disappears

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Ticket URL: <https://core.trac.wordpress.org/ticket/57322>
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