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In 11 Nov 2014 editor's draft, the spec says: "If index is greater than or equal to the length attribute then return undefined and abort these steps." However, the href for "length" is "#widl-SourceBufferList-length", incorrectly referencing SourceBufferList, not TrackBufferList.
Change committed... https://github.com/w3c/media-source/commit/04130c0a69fc8e1c11093fe1116935d75f46b179