There are a few things that are not supported in the HTML5 audio and video specification:
- Streaming audio and video. That is, there is currently no standard for bitrate switching in HTML 5 video; only full media files are supported by current implementations. However, there are aspects of the spec that are designed to support streaming media in the future once the formats are supported.
- Media is restricted by HTTP cross-origin resource sharing.
- Full-screen video is not scriptable because it could be considered a security violation to let a scriptable element take over the full screen. However, browsers have the option of letting users choose to view videos in full screen through additional controls.
- Accessibility for audio and video elements is not fully specified yet. Work is underway on a specification called WebSRT for subtitle support based on the popular SRT format.
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