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import jQuery from "../core.js";
// Note: an element does not contain itself
jQuery.contains = function( a, b ) {
var adown = a.nodeType === 9 ? a.documentElement : a,
bup = b && b.parentNode;
return a === bup || !!( bup && bup.nodeType === 1 && (
// Support: IE 9 - 11+
// IE doesn't have `contains` on SVG.
adown.contains ?
adown.contains( bup ) :
a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
) );
};
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