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The HTML specification does not specify which video and audio formats browsers should support. User agents are free to support any video formats they feel are appropriate, but content authors cannot assume that any video will be accessible by all complying user agents, since user agents have no minimal set of video and audio formats to support.
Auto-Play is a feature used by some websites containing at least one embedded video or audio element wherein the video or audio element starts playing, automatically, without explicit user choice, after some triggering event such as page load or navigating to a particular region of the webpage.
The HTML5 draft specification adds video and audio elements for embedding video and audio in HTML documents.The specification had formerly recommended support for playback of Theora video and Vorbis audio encapsulated in Ogg containers to provide for easier distribution of audio and video over the internet by using open standards, but the recommendation was soon after dropped.
Media Source Extensions (MSE) is a W3C specification that allows JavaScript to send byte streams to media codecs within web browsers that support HTML video and audio. [5] Among other possible uses, this allows the implementation of client-side prefetching and buffering code for streaming media entirely in JavaScript .
GZIP compression for HTML, JS and CSS files [33] LZMA or DEFLATE for SWF files Image formats Depends PNG, JPEG, SVG, Animated GIF [note 1] [34] PNG, JPEG, JPEG-XR, Single-frame GIF [35] [36] Video formats Depends 90+% support of H.264; [37] varying support of WebM and Ogg Theora (see HTML video) H.264, Sorenson Spark, and On2 VP6 [38] Streaming ...
PerceivedType can be set to "image", "audio" or "video" to class files into Pictures, Music or Video content types respectively. There are other PerceivedTypes known to Windows (text, compressed, system and application) but these are not relevant to AutoPlay. All file type information is stored in the Registry under HKEY_CLASSES_ROOT.
The adoption of HTML audio, as with HTML video, has become polarized between proponents of free and patent-encumbered formats. In 2007, the recommendation to use Vorbis was retracted from the HTML5 specification by the W3C together with that to use Ogg Theora, citing the lack of a format accepted by all the major browser vendors.
WebVTT (Web Video Text Tracks) is a World Wide Web Consortium (W3C) standard for displaying timed text in connection with the HTML5 <track> element.. The early drafts of its specification were written by the WHATWG in 2010 after discussions about what caption format should be supported by HTML5—the main options being the relatively mature, XML-based Timed Text Markup Language (TTML) or an ...