[wp-trac] [WordPress Trac] #47727: Additional CSS warns about invalid CSS, though it's perfectly valid

[WordPress Trac]

#47727: Additional CSS warns about invalid CSS, though it's perfectly valid
--------------------------+-----------------------------
 Reporter:  ZanderZ       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  5.2.2
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Add the following to Customize -> Additional CSS:

 {{{
 .foo {
     display: grid;
     gap: 0.25em;
     grid-gap: 0.25em;
     grid-template-columns: repeat(4, 1fr);
 }
 }}}

 WordPress will give an error that the CSS is invalid (Expected RBRACE at
 the position of 1fr) and gives a warning that `gap` and `grid-gap` are
 "Unknown property"s.
 All of this is perfectly fine CSS and WordPress should not give an
 error/warning about this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47727>
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