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current: "The attribute, if specified, must have a value that is a set of space-separated tokens representing the various WAI-ARIA roles that the element belongs to." suggested: “The attribute, if specified, must have a value that is a set of space-separated tokens; each token must be a non-abstract role defined in the WAI-ARIA specification [WAI-ARIA].” http://www.w3.org/html/wg/drafts/html/master/dom.html#aria-role-attribute
fixed https://github.com/w3c/html/commit/1ac433e47f0e498e2068f7241412f2653bb7e1e1