Today the   Timed Text Working Group   published   IMSC Hypothetical Render Model   as a W3C Proposed Recommendation. This specification specifies an Hypothetical Render Model (HRM) that constrains the presentation complexity of documents that conform to the Text Profiles specified in any edition of Internet Media Subtitles and Captions ([ IMSC ]). The model is not intended as a specification of the processing requirements for implementations. For instance, while the model defines glyph cache for the purpose of modelling how the number of glyph drawing operations can be reduced, it neither requires the implementation of such a cache, nor models the sub-pixel glyph positioning and anti-aliased glyph rendering that can be used to produce text output. Furthermore, the model is not intended to constrain readability complexity. Introduction: Mastering Digital Growth in 2025—From SEO to Social Media and AI In 2025, digital success isn’t just about having an online p...

The  Timed Text Working Group  has published a Candidate Recommendation of  TTML Profiles for Internet Media Subtitles and Captions 1.2 . This specification defines two profiles of [ ttml2 ]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats. This specification improves on [ ttml-imsc1.1 ] by supporting contemporary practices, while retaining compatibility with [ttml-imsc1.1] documents. It provides one new feature, which permits external font files to be referenced explicitly. One existing feature has been clarified, and no features have been deprecated in this version.

4 April 2019 The  Timed Text Working Group  has published an updated Candidate Recommendation of  WebVTT: The Web Video Text Tracks Format . This specification defines WebVTT, the Web Video Text Tracks format. Its main use is for marking up external text track resources in connection with the HTML <track> element. WebVTT files provide captions or subtitles for video content, and also text video descriptions  [MAUR] , chapters for content navigation, and more generally any form of metadata that is time-aligned with audio or video content. This specification is based on the  Draft Community Group Report  of the  Web Media Text Tracks Community Group .

The  Timed Text Working Group  invites implementations of an updated Candidate Recommendation of  Timed Text Markup Language 1 (TTML1) (Third Edition) . This document specifies Timed Text Markup Language (TTML), Version 1, also known as TTML1, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language 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. It 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, TTML Content may be used directly as a distribution format, for example, providing a standard content format to reference from a  <track>  eleme...

The  Timed Text Working Group  invites implementations of an updated  Timed Text Markup Language 2 (TTML2) Candidate Recommendation. This document specifies the Timed Text Markup Language (TTML), Version 2, also known as TTML2, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language 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.

11 May 2018 The  Timed Text Working Group  invites implementations of  WebVTT: The Web Video Text Tracks Format  Candidate Recommendation. This specification defines WebVTT, the Web Video Text Tracks format. Its main use is for marking up external text track resources in connection with the HTML element. WebVTT files provide captions or subtitles for video content, and also text video descriptions [MAUR], chapters for content navigation, and more generally any form of metadata that is time-aligned with audio or video content. This specification is based on the  Draft Community Group Report  of the  Web Media Text Tracks Community Group .

3 May 2018 The  Timed Text Working Group  invites implementations of  TTML Profiles for Internet Media Subtitles and Captions 1.1  Candidate Recommendation. This specification defines two profiles of [ TTML2 ]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats.

The  Timed Text Working Group  invites implementations of the  Timed Text Markup Language 2 (TTML2)  Candidate Recommendation. This document specifies the Timed Text Markup Language (TTML), Version 2, also known as TTML2, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language 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.

19 May 2015 The Timed Text Working Group invites implementation of the Candidate Recommendation of TTML Text and Image Profiles for Internet Media Subtitles and Captions 1.0 . This document specifies two profiles of TTML1: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats. The text profile is a superset of TTML Simple Delivery Profile for Closed Captions (US). Learn more about the Video in the Web Activity .

The Timed Text Working Group has published a W3C Recommendation of Timed Text Markup Language 1 (TTML1) (Second Edition) . This document specifies Timed Text Markup Language (TTML), Version 1, also known as TTML1, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language 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. It 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, TTML Content may be used directly as a distribution format, for example, providing a standard content format to reference from a <track> element in an HTML5 document, or a <text> or ...

31 January 2013 The Timed Text Working Group has published a Working Draft of Timed Text Markup Language (TTML) 1.0 (Second Edition) . This document specifies the Timed Text Markup Language (TTML) in terms of a vocabulary and semantics thereof. Learn more about the Video in the Web Activity .

03 January 2013 The Timed Text Working Group has published a Last Call Working Draft of Simple Delivery Profile for Closed Captions (US) . This document, expected to become a Group Note, specifies the Simple Online Delivery Profile (US) of the Timed Text Markup Language (TTML). The primary goal of the profile is to establish a minimum level of interoperability between TTML10 and legacy caption formats employed in US markets, such as CEA608 and CEA708. Comments are welcome through 31 January. Learn more about the Video in the Web Activity .

13 September 2012 The Timed Text Working Group has published the First Public Working Draft of Simple Delivery Profile for Closed Captions (US) . This document defines the behavior expected of a presentation processor using the player constraints for such an online delivery profile. The Simple Online Delivery profile is focused on streamlined delivery of closed captions on the Internet. This interoperability profile supports 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. The Simple Delivery Profile for Closed Captions focuses interoperability using TTML 1.0 to support delivery of closed captions for video content. Other profiles based on TTML 1.0 may target other types of subtitles such as on-screen text or graphics. This interoperability profile is a proper subset of TTML 1.0 plus features required to support US Government closed captioning requirements for onlin...