Since this works only on such a small subset of runtimes (it only manages to slow down my Android browser), you might as well write in ActiveX and slap a HTML5 doctype to it. Kudos on the hackery, don't get me wrong, I'm all for taking devices where they weren't meant to go. My issue is with a world where this kind of fragmented support will again become common, just when we were starting to have a grip on actual sta…
I think the whole point of this experiment is to try out a new and cool piece of tech that might not be supported across the browser spectrum just yet but it doesn't mean that it won't be ever.
Just look at the many other CSS specs that were not supported across browsers only a few years ago but now are considered official standards by the W3C and all the major browser developers.