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Synchronized Multimedia Integration Language (SMIL 2.1)

W3C Recommendation 13 December 2005

This version:
Latest SMIL 2 version:
Latest SMIL Recommendation:
Previous version:
Dick Bulterman, CWI - Guido Grassel, Nokia - Jack Jansen, CWI - Antti Koivisto, Nokia - Nabil Layaïda, INRIA - Thierry Michel, W3C - Sjoerd Mullender, CWI - Daniel Zucker, Access Co., Ltd.

This document is also available in these non-normative formats: XML.This document is also available in these non-normative formats: single HTML file, zip archive.

Please refer to the errata for this document, which may include normative corrections.
See also translations.


This document specifies the second version of the Synchronized Multimedia Integration Language (SMIL, pronounced "smile"). SMIL 2.1 has the following design goals:

Status of this document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at

This document is a Recommendation of the W3C. It has been reviewed by W3C Members and other interested parties and has been endorsed by the Director as a W3C Recommendation. It is a stable document and may be used as reference material or cited as a normative reference from another document. W3C's role in making the Recommendation is to draw attention to the specification and to promote its widespread deployment. This enhances the functionality and interoperability of the Web.

This SMIL 2.1 edition is a new version, it extends the functionalities contained in SMIL 2.0 [SMIL20], incorporating new features useful within the mobile industry.
This SMIL 2.1 W3C Recommendation supersedes the 07 January 2005 SMIL 2.0 Recommendation (Second Edition) [SMIL20].

The SMIL 2.1 test suite along with an implementation report are publicly released and are intended solely to be used as proof of SMIL 2.1 implementability. It is only a snapshot of the actual implementation behaviors at one moment of time, as these implementations may not be immediately available to the public. The interoperability data is not intended to be used for assessing or grading the performance of any individual implementation.

This document has been produced by the SYMM Working Group as part of the W3C Synchronized Multimedia Activity, following the procedures set out for the W3C Process. The goals of the SYMM Working Group are discussed in the SYMM Working Group Charter.

The patent policy for this document is the 5 February 2004 W3C Patent Policy. Patent disclosures relevant to this specification may be found on the SYMM Working Group's patent disclosure page.

An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) with respect to this specification should disclose the information in accordance with section 6 of the W3C Patent Policy.

The authors of this document are the SYMM Working Group members. Different parts of the document have different editors.

Please report errors in this document to - (public archives) including the prefix'[SMIL21 REC]' in the subject line.

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