How will HTML5 cross-browser history differ from CSS / JS?

Question

When CSS and JS became popular, the big disappointment was that every browser implemented it differently, and only a limited set of “cool stuff” worked in browsers or worked differently.

Now we are making HTML5 popular, so it seems like we're going to start the journey again on CSS / JS incompatibilities, but now in a 3D, animated and video-playing style.

My question is, are large browsers different implementations of HTML5 in such a way that we are moving the same way again? Is there another IE6 around the corner?

If not, what makes this story different?

Answer 1

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Answer 2

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IE6 ?

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Assuming not so innocent. Q: This will not be different, you can use Silverlight safely (and stop evangelism) :-)