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FF modifies the DOM in the following two cases: * aria-activedescendant when the AT requests, via the API, for the focus to be moved * aria-selected when the AT requests, via the API, for the selection to be changed Does IE also modify the DOM in these or any other cases? The issue is that the ARIA spec has a normative MUST statement prohibiting UAs from modifying the DOM. We need an implementation in addition to Safari or ARIA will fail CR.
See ACTION-444 for response to this.