This page summarizes the relationships among specifications, whether they are finished standards or drafts. Below, each title
links to the most recent version of a document.
For related introductory information, see: Audio and Video.
Completed Work
W3C Recommendations have
been reviewed by W3C Members, by software developers, and by other
W3C groups and interested parties, and are endorsed by the
Director as Web Standards. Learn more about the W3C Recommendation
Track.
Group Notes are not standards and do not
have the same level of W3C endorsement.
Standards
Group Notes
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2013-02-05
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The Simple Online Delivery profile is focused on streamlined delivery of
closed captions on the Internet, supporting core TTML features to
deliver content originating legacy formats such as CEA-608 and -708
content, and is targeted primarily for delivery in US markets.
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2006-04-27
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This Note describes usage scenarios and requirements for a timed
text authoring format. A timed text authoring format is a content type
that represents timed text media for the purpose of interchange among
authoring systems. Timed text is textual information that is
intrinsically or extrinsically associated with timing information..
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Drafts
Below are draft documents:
other Working Drafts.
Some of these may become Web Standards through the W3C Recommendation Track
process. Others may be published as Group Notes or
become obsolete specifications.
Other Working Drafts
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2013-01-31
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This document specifies the distribution format exchange profile (DFXP) of
the timed text authoring format (TT AF) in terms of a vocabulary and
semantics thereof.
The timed text authoring format is a content type that represents timed
text media for the purpose of interchange among authoring systems. Timed text
is textual information that is intrinsically or extrinsically associated with
timing information.
The Distribution Format Exchange Profile is intended to be used for the
purpose of transcoding or exchanging timed text information among legacy
distribution content formats presently in use for subtitling and captioning
functions.
In addition to being used for interchange among legacy distribution
content formats, DFXP content may be used directly as a distribution format,
for example, providing a standard content format to reference from a
<text> or <textstream> media object
element in a [SMIL 2.1] document.
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2012-01-03
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Aggregates requirements of a user with disabilities with respect to audio and video on the Web, providing background on user needs, alternative content technologies, and their application on the Web.
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W3C 
