[wp-trac] [WordPress Trac] #30781: broken "Header" screen in new update 4.1

[WordPress Trac]

#30781: broken "Header" screen in new update 4.1
---------------------------+-----------------------------
 Reporter:  lennybratcher  |       Owner:
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  Future Release
Component:  Customize      |     Version:  4.1
 Severity:  normal         |  Resolution:
 Keywords:  needs-patch    |     Focuses:  javascript
---------------------------+-----------------------------
Changes (by westonruter):

 * keywords:  reporter-feedback => needs-patch
 * focuses:   => javascript
 * version:   => 4.1
 * milestone:  Awaiting Review => Future Release


Comment:

 Looks like it is due to older versions of IE not supporting
 `Array.prototype.indexOf`. We need a polyfill.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30781#comment:12>
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