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I'm with touche. Why in the world is AMP telling iOS to do scrolling different from other pages? What's the benefit? Why bother?

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Everything scroll related is in CSS. The long explanation is here https://medium.com/@dvoytenko/amp-ios-scrolling-and-position...

I'm well aware of how janky position: fixed on mobile. The solution is not to use position: fixed, not to try to "fix" it and make the experience bad.

IIRC the iOS UIScrollView has a different scroll behaviour when it's inside a UIWebView. So they might have reset that difference.

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