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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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