Is this HTML5?

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This section is non-normative.

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In short: Yes.

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In more length: "HTML5" has at various times been used to refer - to a wide variety of technologies, some of which originated in this - document, and some of which have only ever been tangentially - related.

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This specification actually now defines the next generation of - HTML after HTML5. HTML5 reached Last Call at the WHATWG in October - 2009, and shortly after we started working on some experimental new - features that are not as stable as the rest of the - specification. The stability of sections is annotated in the - margin.

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The W3C has also been working on HTML in conjunction with the - WHATWG; at the W3C, this document has been split into several parts, - and the occasional informative paragraph or example has been removed - for technical or editorial reasons. For all intents and purposes, - however, the W3C HTML specifications and this specification are - equivalent (and they are in fact all generated from the same source - document). The minor differences are:

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Instead of this section, the W3C version has a different - paragraph explaining the difference between the W3C and WHATWG - versions of HTML.
The W3C version refers to the technology as HTML5, rather than - just HTML.
Examples that use features from HTML5 are not present in the - W3C version since the W3C version is published as HTML4 due to W3C - publication policies.
The W3C version includes an additional reference to the WCAG - document specifically with regarding to images (by - request).
The W3C version omits a paragraph of implementation advice - because of a - working group decision from May 2010.

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Features that are considered part of the next generation of HTML - beyond HTML5 (and that are therefore not included in the W3C version - of HTML5) currently consist of:

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The device element.
The ping attribute and related hyperlink auditing features.
The timed track model for media elements, the WebSRT format, and related features.

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Features that are part of HTML (and this specification) but that - are currently published as separate specifications as well, and are - not included in the W3C HTML5 specification, consist of:

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Canvas 2D Graphics Context -
Microdata -
Microdata vocabularies -
Cross-document messaging (also known as Communications) -
Channel messaging (also known as Communications) -

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The forms part of this specification was - previously published separately in a specification known as Web - Forms 2.

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Features that are not currently in this document that were in the - past considered part of HTML5, or that were never part of HTML5 but - have been referred to as part of HTML5 in the media, include:

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History

The specification published by the WHATWG is not identical to + this specification. The main differences are that the WHATWG version + includes features not included in this W3C version: some features + have been omitted as they are considered part of future revisions of + HTML, not HTML5; and other features are omitted because at the W3C + they are published as separate specifications. There are also some + minor differences. For an exact list of differences, please see the + WHATWG specification.