Created attachment 265962 [details]
Demo of the test case in the problem description
When using the aria-owns attribute radio controls are not grouped as expected.
Here is a test case:
<div role="radiogroup" aria-owns="r1 r2 r3">
<div role="radio" id="r1">Alpha</div>
<div role="radio" id="r2">Beta</div>
<!-- this one, too. -->
<div role="radio" id="r3">Gamma</div>
In this case the 3rd radio button "Gamma" should be included in the radio group. However, when VoiceOver looks at this it only sees two radio buttons in the group, the 3rd is announced as a radio button without a group.
Spec for aria-owns: http://www.w3.org/TR/wai-aria-1.1/#aria-owns
*** Bug 151429 has been marked as a duplicate of this bug. ***
Created attachment 265964 [details]
Screenshot of demo test case. (second item selected)
Created attachment 265965 [details]
Screenshot of demo test case. (third item selected)