[Webkit-unassigned] [Bug 176937] New: iOS: zoomed scrollable div does not scroll consistently

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176937

            Bug ID: 176937
           Summary: iOS: zoomed scrollable div does not scroll
                    consistently
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10.3
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrew.rousset at pearson.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 320800

  --> https://bugs.webkit.org/attachment.cgi?id=320800&action=review

HTML example file

Steps to reproduce:
1) Open the attachment in iOS Safari on iPad
2) Scroll the scrollable div a few times using scroll gestures (swipe up/down).
3) Zoom page in to any level greater than default view.
4) Perform scroll gesture on the scrollable div.

Expected result: Scrollable div should scroll each time a proper scroll gesture is performed. (Same behavior as default view of the scrollable div)
Actual result: Scrollable div will scroll sometimes, other times the page will be panned or scrolled. 

Notes: See CSS in simple html page attachment for scrolling setup. Also, see attached movie as well for demonstration of behavior.

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