[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:
     Type:  defect (bug)               |      Status:  new
 Priority:  normal                     |   Milestone:  Awaiting Review
Component:  Widgets                    |     Version:  4.9
 Severity:  normal                     |  Resolution:
 Keywords:  has-screenshots has-patch  |     Focuses:  accessibility
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Changes (by afercia):

 * keywords:  has-screenshots => has-screenshots has-patch


Comment:

 [attachment:43137.diff] is a first pass:
 - refactors the previews templates
 - when the images have no alternative text, uses an aria-label attribute
 `Current image has no alternative text. The file name is: %s`
 - makes the gallery preview an unordered list
 - when the gallery has more than 6 images, hides the last image to
 assistive technologies with `aria-hidden="true"` and expands the "more
 images" text with an aria-label attribute. Instead of, for example "+3"
 assistive technologies will announce "Additional images added to this
 gallery: 3"
 - removes an unused `describedById` variable in the gallery template

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Ticket URL: <https://core.trac.wordpress.org/ticket/43137#comment:1>
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