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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html Multipage: http://www.whatwg.org/C#dom-context-2d-measuretext Complete: http://www.whatwg.org/c#dom-context-2d-measuretext Referrer: Comment: are emHeightAscent/Descent using the largest em square in the line box? Posted from: 76.121.138.138 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:28.0) Gecko/20100101 Firefox/28.0
Yeah, this should be clarified. It won't be the largest em square, necessarily, but it'd be the most high and most low respectively.
Checked in as WHATWG revision r8486. Check-in comment: Clarify TextMetrics.emHeightAscent and emHeightDescent in the multifont case. http://html5.org/tools/web-apps-tracker?from=8485&to=8486