[wp-trac] [WordPress Trac] #34595: Add aria-describedby to improve image/caption relationship

[WordPress Trac]

#34595: Add aria-describedby to improve image/caption relationship
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 Reporter:  joedolson      |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Media          |    Version:
 Severity:  normal         |   Keywords:  has-patch dev-feedback
  Focuses:  accessibility  |
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 See also #27402, where we added `aria-describedby` to gallery output.
 Probably should have thought to deal with captioned images at the same
 time!

 Currently, there's minimal semantic relationship between the caption and
 the image, and none that will reliably be recognized by assistive
 technology. In theory figure and `figcaption` should provide a
 relationship, but this doesn't have adequate support.

 In the HTML mode, no relationship exists at all. In HTML mode, I have
 doubts about the method to add aria-describedby used in this patch;
 `str_replace` feels dirty, but it would be backwards-compatible, where
 adding aria-describedby to the `img` element at input would only effect
 future images. In HTML4 mode, the relationship has to be between the `img`
 and the description, not the container, as in the `figure` relationship.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34595>
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