2.1.40 [HTML5:2014] Section 4.7.10.11 Synchronizing multiple media elements

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V0088: The MediaController interface is not supported

The specification states:

 4.7.10.11.1 Introduction
     Each media element can have a MediaController. A MediaController is an object that 
     coordinates the playback of multiple media elements, for instance so that a 
     sign-language interpreter track can be overlaid on a video track, with the two being 
     kept in sync.

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The MediaController interface is not supported.