Counter Represents a CSS counter.

 CubicBezierTransitionFunction Specifies a cubic-bezier curve.

 LinearGradient Represents a linear gradient: http://dev.w3.org/csswg/css-images-3/#linear-gradients

 Point Represents a point value consisting of two distances.

 RadialGradient Represents a radial gradient: http://dev.w3.org/csswg/css-images-3/#radial-gradients

 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

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

 Angle Represents an angle value.

 Color Represents a color value.

 Frequency Represents a time value.

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

 Length Represents an absolute length value.

 Number Represents a float value.

 Percent Represents a percentage value.

 Priority A priority object for comparing priorities.

 Resolution Represents a resolution value.

 Time Represents a time value.

 TransformMatrix Represents a transformation matrix value.

 TransitionFunction Represents a general transform function.

 IDistance Functionality for length computation.

 ITransform Functionality for computing transformation.