[wp-trac] [WordPress Trac] #33229: Customizer: remove the no more used "control-panel-back"

[WordPress Trac]

#33229: Customizer: remove the no more used "control-panel-back"
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 Reporter:  afercia                        |      Owner:
     Type:  defect (bug)                   |     Status:  new
 Priority:  normal                         |  Milestone:  Awaiting Review
Component:  Customize                      |    Version:  trunk
 Severity:  normal                         |   Keywords:
  Focuses:  ui, accessibility, javascript  |
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 The `.control-panel-back` UI control, for clarity the one I've made
 temporary visible in the screenshot below:

 [[Image(https://cldup.com/aDOw240Sem.png)]]

 seems to always be offset -48px and never comes into view.
 [https://wordpress.slack.com/archives/core-customize/p1438443046000664
 Asked on slack] and it appears to be a leftover from #31336.

 Should be removed together with any related JavaScript and CSS, not just
 for cleaning up but also because screen readers may announce "Back" when
 arrowing around there.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33229>
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