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That is odd, I assumed I was already dealing with a block element! Can’t see any mention of the space in the whatwg spec proposals, but I presume it is something unique to media elements.
Thanks for your help!
Alrighty, here’s the problem in its most simplest form: http://errantdispatch.com/~torrance/ver … etest.html
(I recommend viewing it in Firefox as there’s not actually a video, and Safari only displays the video element’s background colour on every third or so refresh.)