Make inert subtrees and inert attr work for accessibility.
Follow-up to these:
inert elements should be removed from the accessibility tree
… or whatever falls out of this W3C mapping discussion.
Looks like the resolution was to map @inert to aria-hidden, and consider @aria-inert for a later version of ARIA.
PFWG-ISSUE-623, currently on ARIA 1.1.
One thing to consider is that the <dialog> behavior in HTML5 allows ancestor elements of the dialog to be inert, which m ay not map directly to @aria-hidden. In other words, what does it mean to have <dialog (not inert) aria-hidden="false"> element inside an ancestor <div inert (aria-hidden="true")>?
*** This bug has been marked as a duplicate of bug 84635 ***