api.Document.ariaNotify - Firefox should also be marked as partial

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

Chromium browsers are marked as partially supporting the document.ariaNotify (and element.ariaNotify) methods on macOS.
See https://github.com/mdn/browser-compat-data/blob/7bb620de9bd19120cdd7dfa87b56b8b3a6347bed/api/Document.json#L778

From our testing, Voice Over had trouble reliably reading these notifications, and could get interrupted by user actions.

Firefox is marked as fully supporting the APIs, even though, under the hood, it very likely uses the same macOS API.

So, it would seem fair to:

• Either have both Chromium and Firefox be marked as partial, for the same reasons.
• Or, have them both marked as fully supported, if we decide that the current support is "good enough".

@janewman said he was doing some testing here. Please let us know if you find something that could help make a decision.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

Similar support data, if both browser engines indeed use the same underlying APIs.

Did you test this? If so, how?

Not yet. To be updated when/if we find relevant test results.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Document/ariaNotify

MDN metadata

Start with api/Document.json around line 778 and compare the Chromium and Firefox entries for Document.ariaNotify; also inspect the related element.ariaNotify data mentioned in the issue. Resolve whether the macOS VoiceOver behavior warrants partial support for both engines or full support for both, then update the support data to match the agreed evidence.