[wp-trac] [WordPress Trac] #47612: Media modal: implement a default title for the modal H1 heading

[WordPress Trac]

#47612: Media modal: implement a default title for the modal H1 heading
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 Reporter:  afercia                    |      Owner:  (none)
     Type:  defect (bug)               |     Status:  new
 Priority:  normal                     |  Milestone:  5.3
Component:  Media                      |    Version:
 Severity:  normal                     |   Keywords:
  Focuses:  accessibility, javascript  |
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 Splitting this out from #47145.

 Now that #47145 proposes to make the Media modal a real ARIA modal dialog,
 it's important that the modal always has a H1 heading. This heading needs
 to be referenced by the `aria-labelledby` attribute set on the dialog
 container.

 Currently, all the core Media modals provide a meaningful text for their
 H1. However, when a title is not passed to the media frame, the modal H1
 is just an empty heading. An empty `<h1>` isn't ideal and should be
 avoided.

 Plugins and theme authors that use `wp.media()` to add a media modal may
 miss to pass a title. As the title is of great importance
 [https://www.w3.org/TR/wai-aria-practices-1.1/#dialog_roles_states_props
 to give the dialog its required accessible name], there should be a simple
 fallback to a default title.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47612>
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