[Webkit-unassigned] [Bug 68617] New: When page scaling is in use position:fixed has incorrect results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68617

           Summary: When page scaling is in use position:fixed has
                    incorrect results
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hclam at google.com
                CC: fsamuel at chromium.org, jknotten at chromium.org,
                    johnme at chromium.org


When using page scaling, elements with position:fixed are not actually fixed but moves as the page scrolls.

This change http://trac.webkit.org/changeset/78928 was trying to address the problem of position:fixed in page scale by moving the element proportionally to document scroll. However the change only works if scale factor is greater than 1.0. The observed behavior with the change is that:

1. When page scale factor is greater than 1.0 and page is scrolled down, element moves up.
2. When page scale factor is less than 1.0 and page is scrolled down, element moves down.

Moreover elements fixed to the right and bottom are incorrectly positioned for all page scale factors.

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