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What is HTML5?
HTML5 is a standard for structuring and presenting content on the World Wide Web which differs from HTML 4.01 and XHTML 1.1. The new HTML5 standard incorporates features which include video playback and drag-and-drop independantly of third-party browser plug-ins such as Adobe Flash. HTML 5 is expected to be completed in 2010.

The Differeces Between HTML5 and HTML 4.01 (Wikipedia)

1. New parsing rules: oriented towards flexible parsing and compatibility; not based on SGML
2. Ability to use inline SVG and MathML in text/html
3. New elements: article, aside, audio, canvas, command, datalist, details, embed, figcaption, figure, footer, header, hgroup, keygen, mark, meter, nav, output, progress, rp, rt, ruby, section, source, summary, time, video New types of form controls: dates and times, email, url, search, color[18] New attributes: ping (on a and area), charset (on meta), async (on script)
4. Global attributes (that can be applied for every element): id, tabindex, hidden, data (custom data attributes)
5. Forms will get support for PUT and DELETE methods too instead of just GET and POST (see Representational State Transfer for use cases)
6. Deprecated elements will be dropped altogether: acronym, applet, basefont, big, center, dir, font, frame, frameset, isindex, noframes, s, strike, tt, u

HTML5 Resources
http://dev.w3.org
http://html5.org
http://www.html5rocks.com
^ A new Google site. ^
http://www.w3schools.com

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