[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
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 Reporter:  ZanderZ       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Customize     |     Version:  5.2.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Changes (by ZanderZ):

 * Attachment "2019-07-17 20.49.18 suusfit.nl dc84bc0d69e7.png" added.

 Proof of the error and warning

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