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Changes
→Features: Update features and extended TV use cases.
* The web content is able to receive the information of Electronic Program Guide (EPG) as well as the dynamic updates provided by broadcasters/service providers.
* A TV program may have multiple video/audio tracks in the same broadcasting stream.
* The web content may realize some flexible applications by manipulating flexibly manipulate multiple tuners. For example, it may only consume one tuner for watching and recording a given channel at the same time. Yet when it comes to switch to another channel to watch, in order not to affect the original recording task against the tuner, the app may take another tunerto do so, if resource permitted, to do so.
=== Stream Streaming management ===
* The web content may play the broadcasting stream content while browsing through the list of other currently broadcasted programs.
* The web content is able to suffice the scenarios of concurrently displaying multiple streams (i.e. Picture-in-Picture).
* This API utilizes [http://www.w3.org/TR/mediacapture-streams/#mediastream MediaStream] interface in [http://www.w3.org/TR/mediacapture-streams/ Media Capture and Streams API] , which contains video and audio tracks, for streaming management. And the streaming content can be played with HTML5 ''<video>'' element by assigning the media stream to [http://www.w3.org/TR/mediacapture-streams/#direct-assignment-to-media-elements HTMLMediaElement].
=== Emergency alert ===
* The web content can receive emergency announcements for earthquake, tsunami, fire, etc.
== DOM API ==
