[Webkit-unassigned] [Bug 134449] New: iOS8 touch overflow scrolling events bubbles to lower z-index scrollable container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=134449

           Summary: iOS8 touch overflow scrolling events bubbles to lower
                    z-index scrollable container
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: iOS
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Events
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jkwok at netflix.com


Created an attachment (id=234084)
 --> (https://bugs.webkit.org/attachment.cgi?id=234084&action=review)
Demo

Scenario:
- 2 scrollable containers with -webkit-overflow-scrolling: touch
- First container occupies the entire document with z-index: 0
- First container has content > its bounds
- Second container occupies a portion of the document with z-index > 0 (e.g. modal)
- Second container has no content, or contents that occupy <= 100% its bounds

On iOS7, the touch events within the second container are captured in the second container and stops propagation up to the first container.

On iOS8, the touch events within the second container propagate up to the first container, i.e. causing the first container's contents to scroll.

Possible regression?

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