Billion Device HTML5[note 1] is a markup language used for structuring and presenting content on the World Wide Web. It is the fifth and current version of the HTML standard.It was published in October 2014 by the World Wide Web Consortium (W3C) to improve the language with support for the latest multimedia, while keeping it both easily readable by humans and consistently understood by computers and devices such as web browsers, parsers, etc. HTML5 is intended to subsume not only HTML 4, but also XHTML 1 and DOM Level 2 HTML.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. 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.
The Mozilla Foundation and Opera Software presented a position paper at a World Wide Web Consortium (W3C) workshop in June 2004, focusing on developing technologies that are backward compatible with existing browsers, including an initial draft specification of Web Forms 2.0. The workshop concluded with a vote—8 for, 14 against—for continuing work on HTML. Immediately after the workshop, the Web Hypertext Application Technology Working Group (WHATWG) was formed to start work based upon that position paper, and a second draft, Web Applications 1.0, was also announced. The two specifications were later merged to form HTML5. The HTML5 specification was adopted as the starting point of the work of the new HTML working group of the W3C in 2007
XML documents must be served with an XML Internet media type (often called "MIME type") such as application/xhtml+xml or application/xml, and must conform to strict, well-formed syntax of XML. XHTML5 is simply XML-serialized HTML5 data (e.g. not having any unclosed tags), sent with one of XML media types. HTML that has been written to conform to both the HTML and XHTML specifications – and which will therefore produce the same DOM tree whether parsed as HTML or XML – is called polyglot markup.
According to a report released on 30 September 2011, 34 of the world's top 100 Web sites were using HTML5 – the adoption led by search engines and social networks. Another report released in August 2013 has shown that 153 of the Fortune 500 U.S. companies implemented HTML5 on their corporate websites.
Since 2014, HTML5 is at least partially supported by most popular layout engines.
The W3C proposed a greater reliance on modularity as a key part of the plan to make faster progress, meaning identifying specific features, either proposed or already existing in the spec, and advancing them as separate specifications. Some technologies that were originally defined in HTML5 itself are now defined in separate specifications:
HTML Working Group – HTML Canvas 2D Context;
Web Apps Working Group – Web Messaging, Web Workers, Web Storage, WebSocket, Server-sent events, Web Components (this was not part of HTML5 though); Note that the Web Applications Working Group was closed in October 2015 and its deliverables transferred to the Web Platform Working Group (WPWG).
IETF HyBi Working Group – WebSocket Protocol;
WebRTC Working Group – WebRTC;
Web Media Text Tracks Community Group – WebVTT.
After the standardization of the HTML5 specification in October 2014, the core vocabulary and features are being extended in four ways. Likewise, some features that were removed from the original HTML5 specification have been standardized separately as modules, such as Microdata and Canvas. Technical specifications introduced as HTML5 extensions such as Polyglot Markup have also been standardized as modules. Some W3C specifications that were originally separate specifications have been adapted as HTML5 extensions or features, such as SVG. Some features that might have slowed down the standardization of HTML5 will be standardized as upcoming specifications, instead. HTML 5.1 is expected to be finalized in 2016, and it is currently on the standardization track at the W3C.
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