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operator	preparent is
	Related Syntax

Summary

Boolean Returns true if the given preparent is an ancestor of the element, false otherwise. Replacing is with isnt will reverse the results.

Syntax

  preparent element-qualifer* (is | isnt) (element-name | element-name-list)

A test that checks to see whether a specified element has a preparent (parent of a parent) with a given element-name. In other words, it answers the question: Is the given preparent an ancestor of the specified element?