[wp-trac] [WordPress Trac] #43197: Nesting @media rule inside @supports rule fails CSS validation

[WordPress Trac]

#43197: Nesting @media rule inside @supports rule fails CSS validation
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 Reporter:  neoqueto     |       Owner:  (none)
     Type:  defect       |      Status:  new
  (bug)                  |
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Customize    |     Version:  4.9.2
 Severity:  normal       |  Resolution:
 Keywords:  dev-         |     Focuses:  ui, css, administration, coding-
  feedback               |  standards
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Changes (by celloexpressions):

 * keywords:   => dev-feedback
 * focuses:  ui, administration, coding-standards => ui, css,
     administration, coding-standards


Comment:

 Is there a Code Mirror update that includes validation for newer CSS
 features? Or is this something that can be fixed directly in core?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43197#comment:3>
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