[Webkit-unassigned] [Bug 180196] New: Horizontally scrollable Div#a in `position: fixed` Div#b prevents vertical scrolling of Div#b

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180196

            Bug ID: 180196
           Summary: Horizontally scrollable Div#a in `position: fixed`
                    Div#b prevents vertical scrolling of Div#b
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: screeny05 at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The problem arises when there's a Div#a which is horizontally scrollable inside a Div#b which is vertically scrollable. When the User now tries to scroll down with the first touch landing on Div#a, Div#b can't be scrolled.

See the Test-Case for this.

https://rawgit.com/screeny05/ece97e39b9664ee6320764945ea2773e/raw/7f52b85a78450e327325d71e071cb8f0556a0b78/ios-scroll-bug-2.html

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