AX: when aria-activedescendant is used with a ComboBox role, focus should not be changed

• Component: Accessibility
• Status: RESOLVED FIXED

[chris fleizach]

Normally, an aria-activedescendant change causes a focus change to be triggered.

However, when used in conjunction with a combo box, this causes problems for Screen readers.

The problem is that the user expects focus to remain in the text field so that the user can keep typing. If it moves to an item in the combobox list, it is not possible to keep typing

[chris fleizach]

rdar://13093327

[chris fleizach]

The solution I think is to not allow focus changes on aria-activedescendant changes for combo boxes.

on the mac, we think we should send a selected children changed notification instead

[chris fleizach]

Created attachment 185973 [details]
patch

[Ryosuke Niwa]

Comment on attachment 185973 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=185973&action=review

> LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications.html:21
> +        window.jsTestIsAsync = true;
> +        window.testRunner.waitUntilDone();

You don't need "window.".

> LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications-expected.txt:2
> +item1

Could you hide this before the test finishes so that the expected result will have less noise?

> LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications-expected.txt:9
> +PASS combo.isEqual(accessibilityController.focusedElement) is true
> +PASS combo.isEqual(accessibilityController.focusedElement) is true

It's not obvious to me what has been tested. It would have been better if comments in the tests were inside debug or they were wrapped in some inline functions, which are then called in evalAndLog.

[chris fleizach]

(In reply to comment #4)
> (From update of attachment 185973 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=185973&action=review
> 
> > LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications.html:21
> > +        window.jsTestIsAsync = true;
> > +        window.testRunner.waitUntilDone();
> 
> You don't need "window.".
> 
> > LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications-expected.txt:2
> > +item1
> 
> Could you hide this before the test finishes so that the expected result will have less noise?
> 
> > LayoutTests/platform/mac/accessibility/combobox-activedescendant-notifications-expected.txt:9
> > +PASS combo.isEqual(accessibilityController.focusedElement) is true
> > +PASS combo.isEqual(accessibilityController.focusedElement) is true
> 
> It's not obvious to me what has been tested. It would have been better if comments in the tests were inside debug or they were wrapped in some inline functions, which are then called in evalAndLog.

Thanks for the feedback. Will update these

[chris fleizach]

http://trac.webkit.org/changeset/141560