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What is meant by HTML5?

HTML5 is the Markup Language for structuring and presenting the content on Web.It's specialty that separate it from earlier versions is that it supports Multimedia. That means it can handle multidimensional video and audios without using external API’s.
Most important syntax of HTML5 is <canvas>, <video>, <audio>.
When Steve Jobs refused to allow Flash on IOS devices, he argued that HTML5 could do everything Flash did. Because Steve jobs wanted to use Open Standard Technology and not the Close Standerd Technology such as Adobe products ,propriety of Adobe only.
HTML 5 is evolving and most mobile application will be on HTML5.You tube also provide HTML5 alternative to FLASH player.
Currently you are seeing mostly Flash Players in Browser,Now in future you will not...because there is HTML5

Sources:
http://en.wikipedia.org/wiki/HTML5
http://www.apple.com/hotnews/thoughts-on-flash/

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