[wp-trac] [WordPress Trac] #63030: Update CSS for `::-moz-placeholder` color

[WordPress Trac]

#63030: Update CSS for `::-moz-placeholder` color
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 Reporter:  afercia         |       Owner:  joedolson
     Type:  defect (bug)    |      Status:  accepted
 Priority:  normal          |   Milestone:  6.9
Component:  Administration  |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  has-patch       |     Focuses:  accessibility, css
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Comment (by logicrays):

 I’ve reviewed the issue. Since Firefox has updated its handling of ::-moz-
 placeholder by using color-mix instead of opacity, we should remove
 opacity: 1 from core and bundled themes where it no longer has any effect.
 Additionally, themes that don’t set a placeholder color should explicitly
 define one using a sufficient contrast value like:

 ::placeholder {
         color: color-mix(in srgb, currentColor 54%, transparent);
 }

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Ticket URL: <https://core.trac.wordpress.org/ticket/63030#comment:12>
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