[Webkit-unassigned] [Bug 245179] New: getKeyframes() returns equal "from" and "to" values for a "width" transition

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245179

            Bug ID: 245179
           Summary: getKeyframes() returns equal "from" and "to" values
                    for a "width" transition
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org
                CC: dino at apple.com, graouts at apple.com

Starting a "width" transition for a simple <div> will return the same values for "from" and "to" when getKeyframes() is called. This cannot be correct since a transition cannot have the same from and to values. Digging into this, this is about this code in ComputedStyleExtractor::valueForPropertyInStyle():

        case CSSPropertyWidth:
            if (renderer && !renderer->isRenderOrLegacyRenderSVGModelObject()) {
                // According to http://www.w3.org/TR/CSS2/visudet.html#the-width-property,
                // the "width" property does not apply for non-replaced inline elements.
                if (!isNonReplacedInline(*renderer))
                    return zoomAdjustedPixelValue(sizingBox(*renderer).width(), style);
            }
            return zoomAdjustedPixelValueForLength(style.width(), style);

In this case we end up calling zoomAdjustedPixelValue(sizingBox(*renderer).width(), style) which simply does not use the values provided in the RenderStyle for the keyframe.

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