30 lines
531 B
JavaScript
30 lines
531 B
JavaScript
(function() {
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function contains(node) {
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if (!(0 in arguments)) {
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throw new TypeError('1 argument is required');
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}
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do {
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if (this === node) {
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return true;
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}
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} while (node = node && node.parentNode);
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return false;
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}
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// IE
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if ('HTMLElement' in this && 'contains' in HTMLElement.prototype) {
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try {
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delete HTMLElement.prototype.contains;
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} catch (e) {}
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}
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if ('Node' in this) {
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Node.prototype.contains = contains;
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} else {
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document.contains = Element.prototype.contains = contains;
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}
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}());
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