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Detect internet explorer browser

Check if the current browser is Internet Explorer (IE):

const isIe = function() {
    const ua = window.navigator.userAgent;
    return ua.indexOf('MSIE') > -1 || ua.indexOf('Trident') > -1;
};

We also can rely on document.documentMode. This property indicates the document compatibility mode of the document which is an integer in IE 5-11. Other browsers return undefined.

const isIE = !!document.documentMode;

Might be useful