(HyperText Markup Language)
HTML5 logo and wordmark.svg
Filename extension
.html, .htm
Internet media type
Type codeTEXT
Uniform Type Identifier (UTI)public.html[1]
Developed byW3C
Initial release28 October 2014 (2014-10-28)[2]
Type of formatMarkup language
StandardHTML 5.2
Open format?Yes

HTML5 is a markup language used for structuring and presenting content on the World Wide Web. It is the fifth and latest major version of HTML that is a World Wide Web Consortium (W3C) recommendation. The current specification is known as the HTML Living Standard and is maintained by a consortium of the major browser vendors (Apple, Google, Mozilla, and Microsoft), the Web Hypertext Application Technology Working Group (WHATWG).

HTML5 was first released in public-facing form on 22 January 2008,[3] with a major update and "W3C Recommendation" status in October 2014.[2][4] Its goals were to improve the language with support for the latest multimedia and other new features; to keep the language both easily readable by humans and consistently understood by computers and devices such as web browsers, parsers, etc., without XHTML's rigidity; and to remain backward-compatible with older software. HTML5 is intended to subsume not only HTML 4 but also XHTML 1 and DOM Level 2 HTML.[5]

HTML5 includes detailed processing models to encourage more interoperable implementations; it extends, improves and rationalizes the markup available for documents and introduces markup and application programming interfaces (APIs) for complex web applications.[6] For the same reasons, HTML5 is also a candidate for cross-platform mobile applications, because it includes features designed with low-powered devices in mind.

Many new syntactic features are included. To natively include and handle multimedia and graphical content, the new <video>, <audio> and <canvas> elements were added, and support for scalable vector graphics (SVG) content and MathML for mathematical formulas was also added. To enrich the semantic content of documents, new page structure elements such as <main>, <section>, <article>, <header>, <footer>, <aside>, <nav>, and <figure> are added. New attributes were introduced, some elements and attributes were removed, and others such as <a>, <cite>, and <menu> were changed, redefined, or standardized. The APIs and Document Object Model (DOM) are now fundamental parts of the HTML5 specification,[6] and HTML5 also better defines the processing for any invalid documents.[7]

  1. ^ "Mac Developer Library: System-Declared Uniform Type Identifiers". Apple. 17 November 2009.
  2. ^ a b "HTML5 specification finalized, squabbling over specs continues". Ars Technica. 29 October 2014. Retrieved 29 October 2014.
  3. ^ Cite error: The named reference HTML5v1 was invoked but never defined (see the help page).
  4. ^ "HTML5 is a W3C recommendation". W3C Blog. World Wide Web Consortium (W3C). 28 October 2014. Retrieved 28 October 2014.
  5. ^ "HTML5 Differences from HTML4". W3C. Introduction. Retrieved 2 March 2018. HTML4 became a W3C Recommendation in 1997. While it continues to serve as a rough guide to many of the core features of HTML, it does not provide enough information to build implementations that interoperate with each other and, more importantly, with Web content. The same goes for XHTML1, which defines an XML serialization for HTML4, and DOM Level 2 HTML, which defines JavaScript APIs for both HTML and XHTML. HTML replaces these documents.
  6. ^ a b "HTML5 Differences from HTML4". W3C. 19 October 2010. Retrieved 4 December 2010.
  7. ^ "HTML 5.2 W3C Recommendation". W3C. 14 December 2017. § 1.10.2 Syntax Errors. Retrieved 29 June 2017.

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