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But, in practice, what percentage of Flash content expects rollover capability and what percentage of HTML content expects it?

Does a hammer use stairs? You can do rollovers with Javascript - many sites do. Bit you don't have to.

That's the point, the same applies to Flash.

JavaScript (in mobile webkits) also implements touch events, while Flash doesn't.

I stand corrected, thank you.

Only in a not-yet-shipping version.