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"Authors MUST set aria-hidden="true" on content that is not displayed, regardless of the mechanism used to hide it. This allows assistive technologies or user agents to properly skip hidden elements in the document." http://rawgit.com/w3c/aria/master/aria/aria.html#aria-hidden suggest this is an unnecessary requirement, as display:none alone is enough [1], and one that is rarely followed and should be removed. [1] http://www.html5accessibility.com/tests/hidden2013.html