JS - Adding a class just to Internet Explorer
if (navigator.appName == 'Microsoft Internet Explorer' || !!(navigator.userAgent.match(/Trident/) || navigator.userAgent.match(/rv:11/)) || (typeof $.browser !== "undefined" && $.browser.msie == 1)) {
// var f = document.getElementById("emailNewsOffers");
// f.className += " ie-checkbox";
// f.classList.add("ie-checkbox");
document.getElementById("emailNewsOffers").className += " ie-checkbox";
}