[Webkit-unassigned] [Bug 173250] New: Fixed position elements fail with backdrop-filter applied.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173250

            Bug ID: 173250
           Summary: Fixed position elements fail with backdrop-filter
                    applied.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanwilke at gmail.com

When you have a fixed position element in mobile Safari with something like `backdrop-filter: blur(4px)` applied, the "fixed" element is no longer fixed as you scroll down the page and randomly moves position.

I had this applied to the mobile header of a website and the header would not stay fixed to the top unless I remove the backdrop-filter effect.

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