[wp-trac] [WordPress Trac] #63011: Customizer: The back button is not keyboard focusable

[WordPress Trac]

#63011: Customizer: The back button is not keyboard focusable
---------------------------+-----------------------------
 Reporter:  wildworks      |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Customize      |    Version:
 Severity:  normal         |   Keywords:
  Focuses:  accessibility  |
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 The back button in the Customizer has `tabindex="-1" applied to it, so
 it's not keyboard focusable:

 https://github.com/WordPress/wordpress-
 develop/blob/54e97c4c9a9ad71e6005d7e61e4f011ab08d1d4a/src/wp-includes
 /class-wp-customize-nav-menus.php#L1148

 Therefore, keyboard-only users will have to hit the close button to return
 to the dashboard before they can access another submenu.

 From my testing, it looks like we can remove the `tabindex=-1` (and add
 `type="button"`).

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Ticket URL: <https://core.trac.wordpress.org/ticket/63011>
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