[Webkit-unassigned] [Bug 79772] New: WebKit does not interpolate between cross-fade() and url() or cross-fade()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79772

           Summary: WebKit does not interpolate between cross-fade() and
                    url() or cross-fade()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://dabblet.com/result/gist/1931852
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: lea at verou.me
                CC: simon.fraser at apple.com, dino at apple.com


Hover over the image in the testcase. A 1s transition should occur, but it doesn't.

Although WebKit uses cross-fade() to interpolate between two url()s, it does not interpolate between a cross-fade() and a url() or between two cross-fade()s, even with the exact same images (and a different percentage).

In the case of cross-fade(url(A), url(B), X%) and url(A), the latter should be treated as cross-fade(url(A), url(B), 0%). 

Relevant: Since cross-fade() accepts any <image> as an argument and returns an <image>, it should allow nesting, i.e. cross-fade(cross-fade(url(A), url(B), 50%), cross-fade(url(C), url(D), 75%)) should be valid.

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