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Synchronized Multimedia Integration Language (SMIL 3.0)

W3C Recommendation 01 December 2008

This version:
Latest SMIL 3 version:
Latest SMIL Recommendation:
Previous version:
Dick Bulterman, CWI - Jack Jansen, CWI - Pablo Cesar, CWI - Sjoerd Mullender, CWI - Eric Hyche, RealNetworks - Marisa DeMeglio, DAISY Consortium - Julien Quint, DAISY Consortium - Hiroshi Kawamura, NRCD - Daniel Weck, NRCD - Xabiel García Pañeda, Universidad de Oviedo - David Melendi, Universidad de Oviedo - Samuel Cruz-Lara, INRIA - Marcin Hanclik ACCESS Co., Ltd - Daniel F. Zucker, Nokia - Thierry Michel, W3C.

Please refer to the errata for this document, which may include some normative corrections.

This document is also available in a non-normative format: single HTML file.

See also translations.


This document specifies the third version of the Synchronized Multimedia Integration Language (SMIL, pronounced "smile"). SMIL 3.0 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 has been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and is endorsed by the Director as a W3C Recommendation. It is a stable document and may be used as reference material or cited 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 3.0 edition is a new version, it extends the functionalities contained in SMIL 2.1 [SMIL21], incorporating new features useful within the industry.

This SMIL3.0 W3C Recommendation supersedes the 13 December 2005 SMIL 21 Recommendation [SMIL21].

The SMIL 3.0 test suite along with an implementation report are publicly released and are intended solely to be used as proof of SMIL 3.0 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 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 '[SMIL30 REC]' in the subject line.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

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