Re: Question: testing for non-unique id values SC 4.1.1

Proposed clarification for H93 and F77:
<start note>
Note: While checking for non-unique ids, validators consider id values
of elements that are hidden and not rendered on the page.
However, For the purpose of this SC (or from an accessibility
standpoint), hidden elements  using non-unique id values are
problematic only if these elements are referenced by a WAI-ARIA
attribute like aria-describedby, aria-labelledby etc.
</end note>
F77 begins with, "failure condition where duplicate ID errors are
known to cause problems for assistive technologies  ...": Is this not
capturing the SC's intent  with respect to ids?
G134 too acknowledges , "Validation will usually eliminate ambiguities
(and more) because an essential step in validation is to check for
proper use of that technology's markup (in a markup language) or code
(in other technologies)".

Thanks,
Sailesh Panchang

Received on Thursday, 29 September 2016 16:37:52 UTC