[wp-trac] [WordPress Trac] #42613: Custom CSS with errors before 4.9 upgrade can't be corrected after upgrade

[WordPress Trac]

#42613: Custom CSS with errors before 4.9 upgrade can't be corrected after upgrade
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 Reporter:  hptccharge         |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Customize          |     Version:  4.9
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  javascript
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Comment (by westonruter):

 There was probably a JS error in the console. If you restore the erroneous
 CSS and then re-enable syntax highlighting, can you reproduce the issue?
 If so, are there errors in the JS console?

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Ticket URL: <https://core.trac.wordpress.org/ticket/42613#comment:14>
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