Use shorthand method $ and proper support check
Note that I've created `hasSupport` but not using it. I think you might want to use this function instead of the poor UA sniffing to detect support. That said, iOS6 and (I believe) 7 can't preview the video because their blob support is broken (even though they claim to support it). If that's the case, we might want to hide step 2, and just let them upload. Also: I hate Apple. And iTunes. And myself for using these horrible things that Apple provides me with. Like my lovely 16gb RAM MBP.
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