Holy shnikies! About ten years ago, at IGN, I invented an entirely novel bit of media tech we called "portaling" to solve this very problem (where video players and ad units would fall apart if moved). But it was all slight of hand, moving iframes around with a CSS translation engine. Jealous…
Sorry too busy to write docs outside of JS lang :( Typically Web API docs are written by people tasked by either FF or Chrome, so if Google cares enough you would see it when Chrome ships it, otherwise you would definitely see it when FF ships it!
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i've so badly wanted this method for years