[Webkit-unassigned] [Bug 61696] New: background-position on enlarged background-images not pixel perfect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=61696

           Summary: background-position on enlarged background-images not
                    pixel perfect
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bartbruil at gmail.com


Created an attachment (id=95278)
 --> (https://bugs.webkit.org/attachment.cgi?id=95278&action=review)
Small demo of the rendering issue

If we have an image and use it as background in a div and enlarge this background (background-size), we get render issues when moving the div in one direction (top/left)  and the background-image in the opposite direction (background-position).

So moving the div 10 pixels down and the background-image 10 pixels up, results in a small shift of the position of the image when rendering.
When using this in animations it shows the image bouncing around a bit. What is expected is the image remaining at the same position, rendered the same.

This happens mostly when the image has been resized, even a little. But the heavier the initial resize the heavier the effect.

A html/css demo is in the attachment.

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