[wp-trac] [WordPress Trac] #45102: Accessibility Issue: id attribute value must be unique

[WordPress Trac]

#45102: Accessibility Issue: id attribute value must be unique
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 Reporter:  picru                                |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  reopened
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Posts, Post Types                    |     Version:  4.9.8
 Severity:  normal                               |  Resolution:
 Keywords:  dev-feedback 2nd-opinion reporter-   |     Focuses:
  feedback                                       |  accessibility
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Comment (by knutsp):

 (This ticket is not about duplicate `id` attributes.)

 In my Twenty Fifteen theme the `article` element has identical `class` and
 `id` attribute values. I guess a lot of themes does the same (not
 checked).

 If this is reported as an error by an accessibility audit, then that could
 be a false positive.

 If this is a problem for an assistive tool, however, then the problem is
 real, but as far as I know and can find, there is no formal restriction on
 `class` attributes that say it should not be equal to an `id` attribute
 value. Those attributes live in separate name spaces.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45102#comment:4>
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