[wp-trac] [WordPress Trac] #43896: Several flex and grid CSS properties listed as Unknown property in Customizer

[WordPress Trac]

#43896: Several flex and grid CSS properties listed as Unknown property in
Customizer
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 Reporter:  davidjlaietta  |       Owner:  (none)
     Type:  defect (bug)   |      Status:  closed
 Priority:  normal         |   Milestone:
Component:  Customize      |     Version:  4.9
 Severity:  normal         |  Resolution:  worksforme
 Keywords:  has-patch      |     Focuses:  css
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Comment (by westonruter):

 This isn't actually an issue in the Customizer ''per se'' but rather in
 anywhere that core uses the Code Mirror library for editing.

 That said, I'm not seeing `justify-items: space-between;` causing any
 issue in either the Additional CSS of the Customizer or in the Theme File
 Editor when editing `style.css`. So the underlying issue seems to have
 been resolved.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43896#comment:9>
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