[wp-trac] [WordPress Trac] #55962: Upgrade `sanitize_hex_color()` to CSS Color Level 4

[WordPress Trac]

#55962: Upgrade `sanitize_hex_color()` to CSS Color Level 4
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 Reporter:  anrghg                               |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  Formatting                           |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  needs-patch needs-unit-tests dev-    |     Focuses:  css
  feedback                                       |
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Comment (by ocean90):

 One of the benefits of all the `sanitize_*` functions is that you can
 easily use them as a sanitize callback when registering options, metas, or
 REST API fields. As soon as there's an argument you have to work with
 something like a closure to set the argument and ensure no other value is
 passed to the function as the second argument.

 So maybe both?

 Also note that the REST API supports `hex-color` as a format for type
 `string`, see `rest_sanitize_value_from_schema()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55962#comment:6>
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