[Webkit-unassigned] [Bug 238617] New: [iOS] Fixed elements jump when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238617

            Bug ID: 238617
           Summary: [iOS] Fixed elements jump when scrolling
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org
                CC: simon.fraser at apple.com

Converted from a codepen.io test case:

// Just use your mouse wheel and it'll scroll at a steady pace. In Safari, as long as it's 
// in debug mode (NOT an iframe), you'll see that the fixed elements on the left/right JUMP 
// intermittently under heavy load!

You MUST open this in debug mode so that it's not in an iframe!
https://codepen.io/GreenSock/pen/ExoyEyg/c0402caac3044c3f5bb85022450b059b

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