[wp-trac] [WordPress Trac] #45067: Add CSS URL sanitization to kses.

[WordPress Trac]

#45067: Add CSS URL sanitization to kses.
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 Reporter:  peterwilsoncc             |       Owner:  (none)
     Type:  enhancement               |      Status:  new
 Priority:  normal                    |   Milestone:  5.0
Component:  Editor                    |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by pento):

 In [changeset:"43781" 43781]:
 {{{
 #!CommitTicketReference repository="" revision="43781"
 KSES: Allow `url()` to be used in inline CSS.

 The cover image block uses the `url()` function in its inline CSS, to show
 the cover image. KSES didn't allow this, causing the block to not save
 correctly for Author and Contributor users. As KSES does already check
 each attribute name against an allowed list, we're able to add an extra
 check for certain attributes to be able to use the `url()` function, too.

 Props peterwilsoncc, azaozz, pento, dd32.
 See #45067.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/45067#comment:16>
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