The 'clipPath' element itself and its children elements do not inherit clipping paths from ancestors of the 'clipPath' element.

Overlay a red 'rect' with a black 'rect' of a larger size. Define a 'clipPath' with a 'rect' of the same size as the red 'rect', but different 'x' and 'y' offsets. Reference that 'clipPath' from a 'g' element containing another 'clipPath' element. In this latter 'clipPath', specify a 'rect' of the same size and same 'x' and 'y' offsets as the red 'rect', and reference it from the black 'rect' element. Reference the same 'clipPath' elements, but this time with a black 'rect' which overlays a red 'rect' of a larger size. If there is no red on the page, the first 'clipPath' was not inherited by the second 'clipPath'.