// Node.prototype.contains
(function() {
function contains(node) {
if (!(0 in arguments)) {
throw new TypeError('1 argument is required');
}
do {
if (this === node) {
return true;
}
// eslint-disable-next-line no-cond-assign
} while (node = node && node.parentNode);
return false;
}
// IE
if ('HTMLElement' in self && 'contains' in HTMLElement.prototype) {
try {
delete HTMLElement.prototype.contains;
// eslint-disable-next-line no-empty
} catch (e) {}
}
if ('Node' in self) {
Node.prototype.contains = contains;
} else {
document.contains = Element.prototype.contains = contains;
}
}());