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
HTML 4 as of 1997)[2] and, as of December 2012, is a candidate
recommendation of the World Wide Web Consortium (W3C).[3] 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 also XHTML 1 and DOM Level 2
HTML.[2]Following its immediate predecessors HTML 4.01 and XHTML 1.1,
HTML5 is a response to the fact 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.[4] 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.[5] 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
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