[wp-trac] [WordPress Trac] #38685: Replace custom CSS placeholder with default value

[WordPress Trac]

#38685: Replace custom CSS placeholder with default value
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.7
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 As raised by @afercia in #38667:

 > I was staring at the comment used in the placeholder and trying to use
 the keyboard to select/cancel what initially appeared to me being text...
 was wondering why the arrow keys weren't working at all. Maybe it's just
 me being a bit slow :) Since it's formatted like an inline comment `/* */`
 it looks like actual code that can be selected. Maybe potentially
 confusing for users, I'd consider to remove the `/* */`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38685>
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