[wp-trac] [WordPress Trac] #55954: CSS editor marks some lines as errors even though they're perfectly fine

[WordPress Trac]

#55954: CSS editor marks some lines as errors even though they're perfectly fine
--------------------------+-----------------------------------------
 Reporter:  zikamatej     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:  needs-patch has-screenshots
  Focuses:                |
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 I keep getting error messages in the WP CSS Editor in Live view for pieces
 of code which are perfectly fine, even according to a CSS3 validator.
 E.g.:

 {{{
 .post-content a:not(.tags a){
         text-decoration: underline;
 }
 }}}

 It's kinda annoying. Please update it to relevantly mirror CSS versions
 and standards.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55954>
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