"Full of little nooks and crannies where they can roost, big open flight spaces, dry spaces inside, away from the rain, where they can fly around. It is really just an absolutely perfect environment."
An creates a completely separate browsing context with its own window object, its own document, and most importantly;its own prototype chain. A function hooked on HTMLMediaElement.prototype in the parent window is not the same object as HTMLMediaElement.prototype in the iframe’s window. They’re entirely separate objects. If fermaw’s audio element lived inside an iframe, my prototype hook in the parent window would never fire.
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