HTML5 is a core technology markup language of the Internet that is used for presenting and structuring content for the World Wide Web. This is the complete fifth revision of the World Wide Web Consortium’s (W3C) HTML standard.

HTML 5 mainly aims at improving the language with support for the latest multimedia keeping it consistently understood by computers and devices (parsers, web browsers etc.) and easily readable by humans.

HTML5 is a response to the fact that the XHTML and HTML in common use on the World Wide Web are a mixture of features that have been introduced by various specifications along with the ones introduced by software products like web browsers and the ones established by common practice.

HTML5 introduces attributes and elements which reflect typical usage on modern websites. A number of them are semantic replacements for common uses of inline (<span>) elements and generic block (<div>), such as <nav> (website navigation block), <footer> or <audio> and <video> instead of <object>. Some deprecated elements from HTML 4.01 including purely presentational elements like <font> and <center> have been dropped, whose effects have been succeeded by the more capable Cascading Style Sheets. There has also been a renewed emphasis on the DOM scripting importance (like JavaScript) in Web behavior.

HTML5 specifies scripting application programming interfaces (APIs) in addition to specifying markup which can be used with JavaScript. De facto features have been documented and existing DOM (document object model) interfaces have been extended. Also, new APIs are there, such as: Timed media playback, Offline Web Applications, Drag-and-drop, Cross-document messaging, Browser history management, MIME type and protocol handler registration, Microdata, Document editing, the canvas element for immediate mode 2D drawing.

HTML5 has been designed so that old browsers may safely ignore new HTML5 constructs. The HTML5 specification provides detailed rules for parsing and lexing, with the intention that different compliant browsers produce the same result for an incorrect syntax. 


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