[wp-trac] [WordPress Trac] #34951: Authentication modal dialog spinner should disappear when loading is done

[WordPress Trac]

#34951: Authentication modal dialog spinner should disappear when loading is done
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 Reporter:  afercia                 |      Owner:
     Type:  defect (bug)            |     Status:  new
 Priority:  normal                  |  Milestone:  4.5
Component:  Login and Registration  |    Version:  4.4
 Severity:  normal                  |   Keywords:
  Focuses:  ui, accessibility       |
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 Similar to #33311 and other spinner performance-related issues (e.g. in
 the Customizer): the authentication modal dialog uses a spinner image as
 background that's always "spinning"... in the background, even when it's
 hidden by the loaded iframe content.

 See in the screenshot below, where I've made the iframe content semi-
 transparent: the spinner is still there.

 [[Image(https://cldup.com/-C793ZRTLc.png)]]

 Using a powerful machine with a modern CPU and a dedicated GPU you will
 probably notice just a small CPU usage increment but on older machines the
 CPU usage can grow significantly and also get stuck at 100% on very old
 hardware.

 Ideally, spinners as backgrounds should always be removed when no longer
 necessary and the re-painted area should always be reduced to the smallest
 possible area.

 Adding the "accessibility" keyword because the Web should be as much
 accessible as possible regardless of the hardware used, also considering
 that core still supports IE 8 and thus it should also support the hardware
 IE 8 typically runs on.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34951>
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