AX: VoiceOver does not read munder/mover/munderover elements correctly

• Component: Accessibility
• Status: NEW ---

[Frédéric Wang (:fredw)]

Testcases:

1) <math xmlns="http://www.w3.org/1998/Math/MathML"><munder><mi>a</mi><mi>b</mi></munder></math>
2) <math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mi>a</mi><mi>b</mi></mover></math>
3) <math xmlns="http://www.w3.org/1998/Math/MathML"><munderover><mi>a</mi><mi>b</mi><mi>c</mi></munderover></math>

(or see http://trac.webkit.org/browser/trunk/LayoutTests/platform/mac/accessibility/mathml-elements.html)

WebKit exposes the accessible trees for munder/mover/munderover as

Role: AXMathRoleGroup
Subrole: AXMathUnderOver

and attributes AXMathBase, AXMathUnder and AXMathOver pointing to appropriate child accessible objects (base or under/over scripts).

Actual results:

1) a
2) a, with b underneath
3) a, with c underneath

Expected results:

1) a, with b underneath
2) a, with b above
3) a, with b underneath and c above.

[Radar WebKit Bug Importer]

<rdar://problem/21589876>

[Frédéric Wang (:fredw)]

This problem appears in tests 10, 12, 19, 21, 22 of the MathML torture tests

https://mdn.mozillademos.org/en-US/docs/Mozilla/MathML_Project/MathML_Torture_Test$samples/MathML_Torture_Test