2.1.18 [SVG11] Section 14.3.5, Establishing a new clipping path


The specification states:

 A 'clipPath' element can contain 'path' elements, 'text' elements, basic shapes (such as 'circle') or a 'use' element. If a 'use' element is a child of a 'clipPath' element, it must directly reference 'path', 'text' or basic shape elements. Indirect references are an error (see Error processing).

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

The clipPath element allows indirect references. Indirect references are not an error.