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35 lines
643 B
JavaScript
35 lines
643 B
JavaScript
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// Node.prototype.contains
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(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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// eslint-disable-next-line no-cond-assign
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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 self && 'contains' in HTMLElement.prototype) {
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try {
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delete HTMLElement.prototype.contains;
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// eslint-disable-next-line no-empty
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} catch (e) {}
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}
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if ('Node' in self) {
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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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