[wp-trac] [WordPress Trac] #56391: safecss_filter_attr(): support rgba background-color

[WordPress Trac]

#56391: safecss_filter_attr(): support rgba background-color
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 Reporter:  wildworks     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Security      |    Version:  trunk
 Severity:  normal        |   Keywords:  has-patch
  Focuses:                |
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 This ticket allows rgba-valued background-color in `safecss_filter_attr`.

 It was (https://github.com/WordPress/gutenberg/issues/39402) in Gutenberg
 that triggered this ticket.

 In RichText, when an inline text color is specified, a transparent
 background color style (`background-color:rgba(0, 0, 0, 0)`) is generated
 at the same time.
 This is to disable the browser's default style (yellow for Chrome), since
 highlighted text is wrapped with a mark tag.

 However, this background color is sanitized by `wp_kes_post`, and the
 browser's default style is restored.

 This ticket proposes to allow `rgba` values only for `background-color`.
 Please check with the additions to the Unit Test to see what values are
 allowed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56391>
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