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SVG mask is not a transformable element: http://www.w3.org/TR/SVG/masking.html#InterfaceSVGMaskElement References to mask & maskUnits should be removed from sections 13.5 and 13.6 of the CSS Transforms spec: http://dev.w3.org/csswg/css3-transforms/#svg-three-dimensional-functions http://dev.w3.org/csswg/css3-transforms/#svg-user-coordinate-space
Fixed with the latest commit.