[Webkit-unassigned] [Bug 239288] New: Scroll chaining on iOS does not occur in certain overflow cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239288

            Bug ID: 239288
           Summary: Scroll chaining on iOS does not occur in certain
                    overflow cases
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: harry-moore at live.co.uk
                CC: simon.fraser at apple.com

If we scroll on an element that is overflowing, its scroll should chain to scroll its parent when its scroll position is at the end.

In this codepen (https://codepen.io/HazzMan2409/pen/KKZxxGx) this does not happen when you scroll vertically on the child.

There is an element in between the two vertically scrolling elements that scrolls in the opposite direction, I believe it is that element that is causing the bad behavior.

Note that this behaves fine on desktop Safari.

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