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Polyfill for CustomEvent constructor in IE9-11. All credit to:
(function () {
if ( typeof window.CustomEvent === "function" ) return false;
function CustomEvent ( event, params ) {
params = params || { bubbles: false, cancelable: false, detail: undefined };
var evt = document.createEvent( 'CustomEvent' );
evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
return evt;
CustomEvent.prototype = window.Event.prototype;
window.CustomEvent = CustomEvent;
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