Installs §75's hidden DOM accessibility mirror over root and returns it.
Creates one visually-hidden container (appended to document.body when that
exists), projects every focusable / labelled / role-bearing widget under
root, and subscribes to widget setters so subsequent disabled,
checked, value, label, and role writes push into the projection.
Installs §75's hidden DOM accessibility mirror over
rootand returns it.Creates one visually-hidden container (appended to
document.bodywhen that exists), projects every focusable / labelled / role-bearing widget underroot, and subscribes to widget setters so subsequentdisabled,checked,value,label, androlewrites push into the projection.