Why iframe scrolling doesn't work on mobile Safari?

iFrames inside fixed-height elements will not scroll on iOS devices ...

About once a year I will run into this problem, checking something that I did on the iPhone or iPad. I have a moment of confusion / disappointment, then I remember "Oh yes ... it STILL DOES NOT work."

Today my question is: WHY is this?

If this is not clear, I already know that you cannot scroll iframes in fixed / absolute div positions, and I am not asking for workarounds (they are well documented elsewhere). I want to know why . After 3 years or so, this no longer seems like a mistake. Is Apple such a way? Did Uncle Steve hate iframes almost as much as Flash? What is going on with this?

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