Counter Represents a CSS counter.

 CubicBezierTimingFunction Specifies a cubic-bezier curve.

 Shadow The shadow class for holding information about a box or text-shadow.

 Shape Represents a CSS shape. https://developer.mozilla.org/en-US/docs/Web/CSS/shape

 StepsTimingFunction Specifies a stepping function, described above, taking two parameters.

 GradientStop More information can be found at the W3C: http://dev.w3.org/csswg/css-images-3/#color-stop-syntax

 Point Represents a point value consisting of two distances.

 IGradient The common interface for all CSS gradients.

 IImageSource Basic interface for all image sources (linear-gradient, radial-gradient, URL, solid, ...).

 ITimingFunction Represents a general timing function.

 ITransform Functionality for computing transformation.