[Webkit-unassigned] [Bug 182521] New: touchmove preventDefault() no longer respected in iOS11.3

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182521

            Bug ID: 182521
           Summary: touchmove preventDefault() no longer respected in
                    iOS11.3
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: steve at suncitydesign.com

Created attachment 333140

  --> https://bugs.webkit.org/attachment.cgi?id=333140&action=review

ReproUnrespectedPreventDefault.html

Steps to reproduce:
- Open Safari on iPad with iOS11.3 (15E5167F) Beta
- Load attach HTML file
- Try to scroll the page
- Notice that "rubberbanding" happens even though preventDefault() is being called on touchmove

Environment:

Reproduced on the following environments:
- Safari on iPad Pro with iOS 11.3 (15E5167F) Beta
- Safari on iPad Mini 2 with iOS 11.3 (15E5167F) Beta

Unable to reproduce on:
- Safari on iPad Pro with iOS 11.2

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