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The IDL for EME's partial interface for HTMLMediaElement [1] defines the HTMLMediaElement.mediaKeys attribute to be non nullable, but the HTMLMediaElement.setMediaKeys() spec says that the HTMLMediaElement.mediaKeys can be null [2]. The mediaKeys attribute should be nullable, i.e.: readonly attribute MediaKeys? mediaKeys; [1] https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#extensions [2] https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-setmediakeys
Added the '?' in https://dvcs.w3.org/hg/html-media/rev/6b2c3622f578.