[Webkit-unassigned] [Bug 53049] New: Wheel scroll is not propagated to overflow: auto elements when on top of position: fixed elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=53049

           Summary: Wheel scroll is not propagated to overflow: auto
                    elements when on top of position: fixed elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mihaip at chromium.org
                CC: hyatt at apple.com, mitz at webkit.org, pkasting at google.com,
                    jamesr at chromium.org
            Blocks: 52988


To reproduce:

Place mouse over the red square (which uses position: fixed) in these pages:

1. http://persistent.info/webkit/test-cases/position-fixed-scrolling/document.html
2. http://persistent.info/webkit/test-cases/position-fixed-scrolling/overflow-auto.html
3. http://persistent.info/webkit/test-cases/position-fixed-scrolling/overflow-auto-document.html

and use the wheel to scroll.

Expected result:

1. Document scrolls
2. overflow: auto div scrolls
3. overflow: auto div scrolls

Actual result:

1. Document scrolls
2. Nothing scrolls
3. Document scrolls

It might be easiest to skip over position: fixed elements when determining where to fire/propagate wheel events.

Firefox 4.0b9 currently behaves like the actual result (WebKit), IE 8 behaves like the expected result.

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