[Webkit-unassigned] [Bug 137851] New: Embedded WebView flickers position: fixed elements during rapid scrolling events

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137851

            Bug ID: 137851
           Summary: Embedded WebView flickers position: fixed elements
                    during rapid scrolling events
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh Intel
                OS: Other
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mikey.m at me.com

Created attachment 240063
  --> https://bugs.webkit.org/attachment.cgi?id=240063&action=review
Video demonstrating the bug

Using an embedded WebView inside of an application using the WebKit framework produces 
flickering of position: fixed elements while rapidly scrolling the page. This behavior 
did not exist until OS X Yosemite, Developer Preview #5 — it is believed to be a result 
of: https://bugs.webkit.org/show_bug.cgi?id=135135

Steps to Reproduce:
1. Create an application with an embedded WebView that uses the version 1 of the WebKit 
   provided WebView infrastructure. Not WKWebView. Normal WebView.
2. Load an HTML page with contains a position: fixed element
3. Scroll rapidly to produce flickering behavior

Expected Results:
The expected result is that the element stays statically fixed with no flickering during 
scrolling events

Actual Results:
position: fixed HTML elements flicker during rapid scrolling events

Build Date & Platform:
First seen: OS X Yosemite, Developer Preview #5
Last tested: Intel Mac OS X 10.10, AppleWebKit/600.1.25

Notes:
This bug report is a copy of: <rdar://problem/18211024>

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