HTML5

HTML5 is not just a refactored HTML4.

HTTML5 is everywhere whether you like it or not.

Is it doing things you couldn't do in HTML4 and JavaScript?

Actually yes. It is. There are some 'very cool' things you can do with HTML5 that was simply not possible before.

HTML5 is fully fledged subject with 'amazing features' that are actually 'useful' in the real world.

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Geolocation

Letting users tell you where there are is so useful. You can provide content that is actually useful to them. You can provide information about people near to them, and so the opportunities are endless.