[wp-trac] [WordPress Trac] #46906: When 'fr' is in the additional CSS area, WordPress shows error.

[WordPress Trac]

#46906: When 'fr' is in the additional CSS area, WordPress shows error.
----------------------------+-----------------------------------------
 Reporter:  mrgarry05       |      Owner:  (none)
     Type:  defect (bug)    |     Status:  assigned
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Customize       |    Version:  5.1.1
 Severity:  normal          |   Keywords:  has-screenshots needs-patch
  Focuses:  administration  |
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 When I add something like
 {{{
 grid-template-columns: 80px auto 1fr;
 }}}
 in additional CSS. WordPress doesn't let me save add it and shows an error
 that RBRACE is missing before 'fr'.

 [[Image(https://imgur.com/MK9Kv3v)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/46906>
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