Created attachment 205204 [details] screen shot showing what appears to be an inaccessible shadow DOM, even those the accessibility is special-cased elsewhere in WebCore AX: ER: accessibility shadow DOM web components (e.g. form elements and media controls) should be done with ARIA markup, not in WebCore.
<rdar://problem/14232277>
This has been overcome by events. It's mostly happening this way now.