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The new aria-modal attribute specifies that the author can set the rest of the document inert but after reading the HTML 5.1 specification, it is not immediately obvious how to do this. Since this ability is something that is likely to be desired in the context of accessibility, does it make sense to actually describe how to do this somewhere? http://www.w3.org/TR/wai-aria-1.1/#aria-modal
Covered in APG