@zcorpan, we're looking at changing the behaviour of allowfullscreen and allowusermedia to match this (no attribute needed for same-origin) -- it doesn't make much sense in the same-origin case anyway, where the child could simply reach into its parent and enable any attributes it needs to access a feature, and trying to restrict it that way makes FP much more difficult to reason about.
The must-be-live nature of allowfullscreen looks like it was never part of the spec, but was an implementation detail that has come to be relied on. If that can't be changed without breaking existing sites, then we might be able to special-case that attribute, but I'd rather not do that for any new features.
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