[Webkit-unassigned] [Bug 186549] New: Scrolling over fixed elements to top when scroll position is 0 will trigger body scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186549

            Bug ID: 186549
           Summary: Scrolling over fixed elements to top when scroll
                    position is 0 will trigger body scroll
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dano.husar at gmail.com

Created attachment 342481

  --> https://bugs.webkit.org/attachment.cgi?id=342481&action=review

Scroll animatio

When you are inside fixed element, and scroll position is at 0, scrolling to top will actually trigger scroll of the body, and while that scroll animation has not finished you can't interact with fixed element.
This can be confusing when fixed element takes full body size, so the whole screen is locked and you dont know why.

See the attached animation for better idea whats going on.

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