[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  |     Focuses:  css
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Changes (by ocean90):

 * type:  defect (bug) => enhancement
 * milestone:  6.1 => Future Release


Comment:

 I don't think `sanitize_hex_color()` can be extend as suggested as it's
 used for various color settings which do not allow more then 3 or 6 digit
 yet. Also, this would be unexpected for any plugin/theme which have some
 custom storage and simply cannot store more than 6 digits.

 Sounds more like a new function `sanitize_hex_with_alpha_color()` would be
 a option here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55962#comment:2>
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