HTML5

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HTML5
(HyperText Markup Language)

HTML5 official logo, introduced on January 18, 2011.
Filename extension	*.html
Internet media type	text/html
Type code	TEXT
Uniform Type Identifier	public.html[1]
Developed by	World Wide Web Consortium and WHATWG
Type of format	Markup language
Extended to	XHTML5[citation needed]
Open format?	Yes
Website	whatwg.org/html www.w3.org/TR/html5

XHTML5

Filename extension	*.xhtml, *.html
Internet media type	application/xml, application/xhtml+xml
Developed by	World Wide Web Consortium and WHATWG
Type of format	Markup language
Extended from	XML, HTML5[citation needed]
Open format?	Yes
Website	www.whatwg.org/specs/web-apps/current-work/multipage/the-xhtml-syntax.html

HTML
HTML and HTML5;  HTML editor Dynamic HTML XHTML XHTML Basic (Mobile) XHTML Mobile Profile and C-HTML HTML element Character encodings; Unicode Language code Document Object Model Browser Object Model Style sheets and CSS Font family and Web colors HTML scripting and JavaScript W3C, WHATWG, and validator Quirks mode HTML Frames HTML5 Canvas, WebGL, and WebCL HTML5 Audio and HTML5 video Web storage Web browser (layout) engine Comparison of document markup languages web browsers layout engine support for HTML;　Non-standard HTML XHTML (1.1) HTML5;  HTML5 canvas, HTML5 media　(Audio, Video)
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HTML5 is a markup language for structuring and presenting content for the World Wide Web and a core technology of the Internet. It is the fifth revision of the HTML standard (created in 1990 and standardized as HTML4 as of 1997)^[2] and, as of October 2012, is still under development. Its core aims have been to improve the language with support for the latest multimedia while keeping it easily readable by humans and consistently understood by computers and devices (web browsers, parsers, etc.). HTML5 is intended to subsume not only HTML 4, but XHTML 1 and DOM Level 2 HTML as well.^[2]
HTML5 is not software that has to be installed but rather a new version of the language HTML. Web browsers must support this new version of HTML in order to correctly display web pages using HTML5 functions. It is upon the developers of browsers to update their software to use HTML5; users simply must allow these updates to be done on their computers, but do not have to install additional software.
Following its immediate predecessors HTML 4.01 and XHTML 1.1, HTML5 is a response to the observation that the HTML and XHTML in common use on the World Wide Web are a mixture of features introduced by various specifications, along with those introduced by software products such as web browsers, those established by common practice, and the many syntax errors in existing web documents.^[3] It is also an attempt to define a single markup language that can be written in either HTML or XHTML syntax. It includes detailed processing models to encourage more interoperable implementations; it extends, improves and rationalises the markup available for documents, and introduces markup and application programming interfaces (APIs) for complex web applications.^[4] For the same reasons, HTML5 is also a potential candidate for cross-platform mobile applications. Many features of HTML5 have been built with the consideration of being able to run on low-powered devices such as smartphones and tablets. In December 2011 research firm Strategy Analytics forecast sales of HTML5 compatible phones will top 1 billion in 2013.^[5]
In particular, HTML5 adds many new syntactic features. These include the new <video>, <audio> and <canvas> elements, as well as the integration of scalable vector graphics (SVG) content (that replaces the uses of generic <object> tags) and MathML for mathematical formulas. These features are designed to make it easy to include and handle multimedia and graphical content on the web without having to resort to proprietary plugins and APIs. Other new elements, such as <section>, <article>, <header> and <nav>, are designed to enrich the semantic content of documents. New attributes have been introduced for the same purpose, while some elements and attributes have been removed. Some elements, such as <a>, <cite> and <menu> have been changed, redefined or standardized. The APIs and document object model (DOM) are no longer afterthoughts, but are fundamental parts of the HTML5 specification.^[4] HTML5 also defines in some detail the required processing for invalid documents so that syntax errors will be treated uniformly by all conforming browsers and other user agents.^{[6]
From--Wikipedia}