[Webkit-unassigned] [Bug 248220] New: [css-text] word-spacing does not allow calculated values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248220

            Bug ID: 248220
           Summary: [css-text] word-spacing does not allow calculated
                    values
           Product: WebKit
           Version: Safari Technology Preview
          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

While we support both fixed and percentage values for word-spacing, we do not support calculated values. The custom BuilderConverter::convertWordSpacing() does not account for calculated values and RenderStyle::setWordSpacing() computes a canned value when dealing with a calculated length. While we added support for blending between percentage and fixed values in bug 248218, this still causes failures in three animation tests where the keyframes use calc()` values:

web-animations/animation-model/animation-types/accumulation-per-property-002.html
web-animations/animation-model/animation-types/addition-per-property-002.html
web-animations/animation-model/animation-types/interpolation-per-property-002.html

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