// Polyfill for IE11
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
if (!String.prototype.startsWith) {
    String.prototype.startsWith = function(search, pos) {
       return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
    };
}