[Webkit-unassigned] [Bug 139068] New: position: fixed; element preceding a CSS transform causes blurriness

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139068

            Bug ID: 139068
           Summary: position: fixed; element preceding a CSS transform
                    causes blurriness
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cthielen at me.com

Created attachment 242238
  --> https://bugs.webkit.org/attachment.cgi?id=242238&action=review
Simple example page which demonstrates the blurriness. If the linked SVG file goes offline, any ~800x800 SVG will do.

(Note: This bug is similar-sounding to https://bugs.webkit.org/show_bug.cgi?id=133801 but as this example doesn't require iframes to trigger, I am filing a separate bug in case it is indeed different.)

A CSS transform applied on an element causes blurriness if an element containing content with position: fixed; exists before the transformed element in the DOM.

It does not happen if the position: fixed; element is blank nor if the fixed element comes after the CSS transform.

See the attached bug.html. Try moving the "position: fixed;" element before and after the img tag.

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