[wp-trac] [WordPress Trac] #48376: Update kses safecss_filter_attr function to allow gradient backgrounds

[WordPress Trac]

#48376: Update kses safecss_filter_attr function to allow gradient backgrounds
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 Reporter:  jorgefilipecosta  |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  General           |    Version:  trunk
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 Currently, our KSES rules remove gradient backgrounds from style
 attributes (on contributor roles).
 The block editor is introducing a mechanism to allow users to create and
 use a custom background. If our KSES rules are not updated, only roles
 with unfiltered HTML permissions will take advantage of this
 functionality.
 I think our KSES rules should be updated. URL backgrounds, for example,
 are accepted, given that's the case, I think gradients should also be
 accepted. Ultimately what one can do with gradient background one can do
 with a URL background.

 Related block editor issue:
 https://github.com/WordPress/gutenberg/issues/17938

 Related block editor PR's:
 https://github.com/WordPress/gutenberg/pull/17603
 https://github.com/WordPress/gutenberg/pull/18001

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Ticket URL: <https://core.trac.wordpress.org/ticket/48376>
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