Bug 246580 – AX: WebKit does not break AX modality when focus is explicitly moved outside the modal

• Component: Accessibility
• Status: RESOLVED FIXED

[Tyler Wilcock]

https://www.w3.org/TR/wai-aria-1.1/#aria-modal

"If focus moves to an element outside the modal element, assistive technologies SHOULD NOT limit navigation to the modal element."

We don't follow this recommendation, and we should.

[Radar WebKit Bug Importer]

<rdar://problem/101209793>

[Tyler Wilcock]

Created attachment 463012 [details]
Patch

[Tyler Wilcock]

Created attachment 463013 [details]
Patch

[chris fleizach]

Comment on attachment 463013 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=463013&action=review

> Source/WebCore/accessibility/AXObjectCache.h:515
> +    enum class WillRecomputeFocus : bool { No, Yes };

"RecomputeFocus" seems like might be enough

> Source/WebCore/accessibility/AXObjectCache.h:517
> +    Element* updateCurrentModalNodeInternal(WillRecomputeFocus = WillRecomputeFocus::No);

both of these are private methods. can they be combined? or renamed to be more specific?

[Tyler Wilcock]

Created attachment 463039 [details]
Patch

[Tyler Wilcock]

(In reply to chris fleizach from comment #4)
> Comment on attachment 463013 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=463013&action=review
> 
> > Source/WebCore/accessibility/AXObjectCache.h:515
> > +    enum class WillRecomputeFocus : bool { No, Yes };
> 
> "RecomputeFocus" seems like might be enough
I chose "WillRecomputeFocus" here because updateCurrentModalNodeInternal needs to know if the calling code knows we will recompute the focus through some other means (e.g. via our modal auto-focusing mechanism). It needs to know this because if the calling context will not recompute focus, and the focused element is outside our modals, we must invalidate modality per-spec.

I feel like "RecomputeFocus" doesn't capture this intent the same way "WillRecomputeFocus" does, but if you feel strongly about RecomputeFocus or some other alternative I'd be willing to make the change.

> > Source/WebCore/accessibility/AXObjectCache.h:517
> > +    Element* updateCurrentModalNodeInternal(WillRecomputeFocus = WillRecomputeFocus::No);
> 
> both of these are private methods. can they be combined? or renamed to be
> more specific?
Fixed by inlining updateCurrentModalNodeInternal into a lambda within updateCurrentModalNode.

[EWS]

Committed 255665@main (b6eab27a3f8d): <https://commits.webkit.org/255665@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 463039 [details].