[Webkit-unassigned] [Bug 154399] New: Position fixed is buggy with overflow:auto scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154399

            Bug ID: 154399
           Summary: Position fixed is buggy with overflow:auto scrolling
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Major
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dvoytenko at google.com

To reproduce:

1. Open http://output.jsbin.com/nayoxe/quiet on iOS
2. Try to scroll fast

Observe:

Top and bottom elements styled with `position:fixed` jump and flicker.

Expected:

`position:fixed` elements should stay put.

Description:

This is a somewhat specific example. It's uses `overflow:auto` scrolling inside of an iframed document, which is a workaround for the fact that iOS doesn't allow iframes to scroll.

Source code: http://jsbin.com/nayoxe/edit?html,css,output

Please advise.

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