Make aria-relevant and ariaRelevant reflect

[sideshowbarker]

The ariaRelevant IDL attribute seems to have been intentionally commented out from the ARIAMixin interface in 646f093 — without any explanation that I could find, including not in the related issue at #1058.

But since at https://w3c.github.io/aria/#idl-reflection-attribute-values the spec says:

All ARIA attributes reflect in IDL as nullable DOMString attributes.

…and since there’s a test case included in http://wpt.live/html/dom/aria-attribute-reflection.html, and WebKit, Gecko, and Blink all pass that test — then it seems ariaRelevant needs to be included in ARIAMixin in the spec.

• "author MUST" tests: N/A
• "user agent MUST" tests: http://wpt.live/html/dom/aria-attribute-reflection.html
• Browser implementations (link to issue or commit):
  • WebKit: Already implemented to reflect
  • Gecko: Already implemented to reflect
  • Blink: Already implemented to reflect
• Does this need AT implementations?
• Related APG Issue/PR:
• MDN Issue/PR:

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[rahimabdi]

Thank you for raising this, @sideshowbarker!

In addition to the WPT test confirming reflection, I am indeed seeing ariaRelevant in the accessibility WebIDL definition files for the 3 major browsers:

• WebKit
• Gecko
• Chromium

@cookiecrook had raised a newer related issue describing the general challenges with reflecting this attribute which was why it was removed: #1267.

I'll assign this one to myself to discuss at a future ARIA WG meeting.

[spectranaut]

Discussed today's aria working group meeting during triage: https://www.w3.org/2024/09/05-aria-minutes#t02

[cookiecrook]

I am indeed seeing ariaRelevant in the accessibility WebIDL definition files for the 3 major browsers

Yes, since this reflects the current reality, let's approve it.... In the meeting this morning I suggested, "revisit after the ongoing IDL discussions resolve," (so @spectranaut added the Do Not Merge label) but since all 3 engines are already shipping it, this is okay to merge as-is, IMO.