var isModernBrowser = (
            'fetch' in window &&
            'assign' in Object
        );

        if ( !isModernBrowser ) {
            var scriptElement = document.createElement('script');

                scriptElement.async = false;
                scriptElement.src = '/etc.clientlibs/cascade.component.authoring/clientlib-polyfills/resources/ie11-polyfills.js';

                var polyfillScriptElement = document.querySelector('#ie11-polyfill-script');

                if (polyfillScriptElement) {
                    polyfillScriptElement.parentNode.insertBefore(scriptElement, polyfillScriptElement.nextSibling);
                }
            }