jQuery.contains()

The $.contains() method returns true if the DOM element provided by the second argument is a descendant of the DOM element provided by the first argument, whether it is a direct child or nested more deeply. Otherwise, it returns false. Only element nodes are supported; if the second argument is a text or comment node, $.contains() will return false.

Note: The first argument must be a DOM element, not a jQuery object or plain JavaScript object.

Example:

Check if an element is a descendant of another.

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$.contains( document.documentElement, document.body ); // true
$.contains( document.body, document.documentElement ); // false
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