HTML 5.1 2nd Edition

W3C Proposed Recommendation,

This version:
Latest published version:
Latest version of HTML:
Editor's Draft:
Previous Versions:
(The Paciello Group)
Former Editors:
(Apple Inc.)
Robin Berjon (W3C)
File an issue (open issues)
Single page version

Errata for this document are recorded as Github issues.

The English version of this specification is the only normative version. Non-normative translations may also be available.


This specification defines the 5th major version, first minor revision of the core language of the World Wide Web: the Hypertext Markup Language (HTML). In this version, new features continue to be introduced to help Web application authors, new elements continue to be introduced based on research into prevailing authoring practices, and special attention continues to be given to defining clear conformance criteria for user agents in an effort to improve interoperability.

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 https://www.w3.org/TR/.

This specification defines the 2nd edition of the 5th major version, first minor revision of the core language of the World Wide Web: the Hypertext Markup Language (HTML). In this version, a significant error with HTML 5.1 has been rectified, as noted in the Errata corrected section.

Errata for this document are recorded as Github issues with the "errata" label. The latest HTML 5.1 editors' draft shows proposed resolutions of errata in situ.

All interested parties are invited to provide implementation and bug reports and other comments through the Working Group's Github repository. These will generally be considered in the development of HTML 5.2.

W3C Advisory Committee members are invited to advise the Director on whether this document should become a W3C Recommendation through the relevant questionnaire in their WBS questionnaires, before 31 August 2017.

The implementation report produced for HTML 5.1 demonstrates that in almost every case changes are matched by interoperable implementation.

The Working Group aims to produce an HTML 5.2 Recommendation in late 2017 that would obsolete this Recommendation.

This document was published by the Web Platform Working Group as a Proposed Recommendation. This document is intended to become a W3C Recommendation. Feedback and comments on this specification are welcome. Please use Github issues. Historical discussions can be found in the public-html@w3.org archives.

Publication as a Proposed Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

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.

This document is governed by the 1 March 2017 W3C Process Document.