[wp-trac] [WordPress Trac] #33228: Customizer initial focus

[WordPress Trac]

#33228: Customizer initial focus
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 Reporter:  afercia       |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Customize     |     Version:  4.2
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  ui, accessibility, javascript
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Comment (by afercia):

 Refreshed patch fixes also the Theme installer overlay focus, see #27705.
 Eventually this patch can be split in two but for now I'd recommend to
 keep all together for testing purposes, will ask the accessibility team to
 test especially with screen readers running and Safari + VoiceOver.

 Three main changes in this patch:
 - no more need of new CSS classes, just use the existing ones
 - in the Theme installer, added a callback for the iframe `load` event
 - the callback is used also to remove the spinner which currently is
 always "spinning" in the background and even if it's not visible, is
 causing high CPU usage especially on old hardware

 Any thoughts, improvements, and feedback welcome.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33228#comment:8>
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