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Clarify overscroll-behaviour for iframe elements
Description
Clarify that using overscroll-property on iframe elements does not have an effect.
Motivation
It might seem that overscroll-property can solve scroll-chaining for iframes, but iframes with scroll bars are not scroll container elements, so this property does not apply. This was surprising and I wasted a lot of time to find out why.
Additional details
firefox issue and chrome issue.
Related issues and pull requests
Preview URLs
(this comment was updated 2022-09-20 22:10:09.636509)