Follow-up of bug 1001641. Here is what we must do to be consistent with what WebKit does: - <mfenced> must be exposed as subrole "AXMathFence". But when we tried to only expose this role without the other two points below, we obtained a crash in VoiceOver (see bug 1001641 comment 13). - We must expose the following attributes for the open/close operators of <mfenced> element: "AXMathFencedOpen" and "AXMathFencedClose". - We must expose the open/close/separators operators as subroles "AXMathFenceOperator" and "AXMathSeparatorOperator". However, these do not appear in our accessible tree yet (see bug 1175747). See attachment 8623956 [details] for a testcase.
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