jQuery.contains()
jQuery.contains( container, contained ) Returns: Boolean
Description: Check to see if a DOM element is within another DOM element.
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version added: 1.4jQuery.contains( container, contained )
containerThe DOM element that may contain the other element.
containedThe DOM element that may be contained by the other element.
Example:
Check if an element is inside another. Text and comment nodes are not supported.
jQuery.contains(document.documentElement, document.body); // true
jQuery.contains(document.body, document.documentElement); // false