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The spec currently defines a new "keySystem" DOM attribute on HTMLSourceElement [1]. The intention was that this could be specified in markup, but that is not what the spec describes. In addition to the partial interface, we need to add a new content attribute named "keysystem" (note the lower case 's'). In the HTML5 spec, this appears under "Content attributes:" in specs (e.g. [2]). There is still the possibility that we will remove this functionality altogether (bug 20336). [1] https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-sourcekeysystem [2] http://www.w3.org/TR/html5/embedded-content-0.html#the-source-element
Fixed: https://dvcs.w3.org/hg/html-media/rev/0fac368f1ba5