Fix feature detection for IE
operator `!` has higher precedence (4) than operator `in` (8). Parentheses are mandatory here.
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@ -209,7 +209,7 @@
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var addEventListener;
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var el = document.createElement('div');
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if (!'addEventListener' in el) {
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if (!('addEventListener' in el)) {
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addEventListener = function (element, eventName, callback) {
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element.attachEvent('on' + eventName, callback);
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};
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