[Webkit-unassigned] [Bug 106535] New: computedStyle() doesn't report intermediate values during a transition of a pseudo element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106535

           Summary: computedStyle() doesn't report intermediate values
                    during a transition of a pseudo element
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://rodneyrehm.de/t/generated-content-computedStyle
                    .html
        OS/Version: Mac OS X 10.7
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mail at rodneyrehm.de
                CC: esprehn at chromium.org


The computedStyle() of a property is supposed to change according to the transition.  While computedStyle() of a regular element behaves as expected (returning intermediate values), it fails on pseudo elements.


Steps to Reproduce:

1. define a CSS transition of any property of :before
2. bind a requestAnimationFrame loop to extract the computedStyle of that property on :before and log to console
3. start the transition


Actual Result:

Output looks like "1px, 100px"


Expected Result:

Output looks like "1px, 3px, 10px, …, 100px"

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