Some parameters cannot be animated, such as the width, height, or quad size of a generator node, because this is rarely of interest.
If you nevertheless wish to animate one of these parameters, you can create a Parameter node, which can be animated, and link it to the connector of the parameter that cannot be animated.
For example, the width, height, or quad size parameters of a Ridged noise node cannot be animated.
To get around this limitation, create a Parameter node, which controls one of the parameters, and animate it.
In the image above, the Parameter node directs the Quad size parameter.