[wp-trac] [WordPress Trac] #45796: Twenty Nineteen: Mobile menu needs improvement for navigating on touchscreen via keyboard

[WordPress Trac]

#45796: Twenty Nineteen: Mobile menu needs improvement for navigating on
touchscreen via keyboard
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 Reporter:  laurelfulford  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Bundled Theme  |    Version:  5.0.2
 Severity:  normal         |   Keywords:  needs-patch
  Focuses:  accessibility  |
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 Copied over from
 https://github.com/WordPress/twentynineteen/issues/723#issuecomment-450173083
 (hattip @afercia):

 When the "more" menu is expanded on a touchscreen device, there are
 several hidden tab stops that cause issues when navigating the site via
 keyboard. These are:

 * hidden sub-menu items are still focusable
 * all the links in the page are still focusable

 When the menu is open it's still possible to tab away from the menu and
 navigate with the keyboard through all the focusable elements in the page.

 If the intent is to show a full-screen menu, the menu should behave like a
 modal and tabbing should be constrained within the modal.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45796>
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