[wp-trac] [WordPress Trac] #43137: Media widgets: Improve the image and gallery previews accessibility

[WordPress Trac]

#43137: Media widgets: Improve the image and gallery previews accessibility
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 Reporter:  afercia                    |       Owner:  afercia
     Type:  defect (bug)               |      Status:  closed
 Priority:  normal                     |   Milestone:  5.2
Component:  Widgets                    |     Version:  4.9
 Severity:  normal                     |  Resolution:  fixed
 Keywords:  has-screenshots has-patch  |     Focuses:  accessibility
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Changes (by afercia):

 * status:  reviewing => closed
 * resolution:   => fixed


Comment:

 In [changeset:"44767" 44767]:
 {{{
 #!CommitTicketReference repository="" revision="44767"
 Accessibility: Improve the image and gallery widgets preview
 accessibility.

 In an authoring context, the image `alt` attribute purpose is different
 from the one for the front end. For example, screen reader users need to
 know what the selected image is, even when the original `alt` value is
 empty.

 This change introduces a new pattern for the `alt` text in an authoring
 context:
 - uses the `alt` text if not empty
 - when there's no `alt` text, informs users the image has no alternative
 text and provides a reference to the image filename

 Also, makes the gallery media widget preview an unordered list to make
 screen readers announce the number of images automatically.

 Fixes #43137.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/43137#comment:13>
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