[Webkit-unassigned] [Bug 158325] New: Fixed position interaction broken with WKWebView when scrollView.bounce is false

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158325

            Bug ID: 158325
           Summary: Fixed position interaction broken with WKWebView when
                    scrollView.bounce is false
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dvpdiner2 at gmail.com
                CC: simon.fraser at apple.com

Created attachment 280380
  --> https://bugs.webkit.org/attachment.cgi?id=280380&action=review
iOS App demonstration case

In a page with a fixed position header that contains interactive elements like buttons or links when shown in a WKWebView with rubberbanding disabled, it is possible for the logical interaction position of the element to get out of sync with the visual position of the element.

This happens when you do a scroll action that would normally trigger the rubberbanding effect. It has the effect of moving the logical position of the element further down the page as if rubberbanding has occurred.
The visual position is correct.

I've attached a simple test case iOS project that can reproduce the issue. The code for the test case is also available on GitHub: https://github.com/dpogue/WKScrollTest

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