[wp-trac] [WordPress Trac] #29311: CSS glitch with Close button in plugin details modal

[WordPress Trac]

#29311: CSS glitch with Close button in plugin details modal
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 Reporter:  SergeyBiryukov      |      Owner:
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  4.0
Component:  Plugins             |    Version:  trunk
 Severity:  minor               |   Keywords:
  Focuses:  ui, administration  |
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 In plugin details modal, when Close button is focused, there's a small
 blue bar on the left (see the screenshot).

 Only happens in Firefox, could not reproduce in Chrome.

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Ticket URL: <https://core.trac.wordpress.org/ticket/29311>
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