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http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Oct/0060.html [[ Given the reasons brought up in this thread I should think that the WG would agree that "SVGElement implements GlobalEventHandlers" is an acceptable way forward. ]] Arguments being http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Oct/0056.html So the SVG spec should say SVGElement implements GlobalEventHandlers; It follows that the SVG spec should also define all event handlers in GlobalEventHandlers as content attributes on all elements in the SVG namespace (including unknown elements).
Yeah, after I've been poking at this in Blink, I've noticed that while a lot of the IDL attributes are on SVGElement, the corresponding content attributes aren't actually reflected, which is silly.