note#1 - ie 11 pollyfill
<!DOCTYPE HTML>
<html>
<body>
<div id="result"></div>
<script type="text/javascript">
if (/MSIE \d|Trident.*rv:/.test(navigator.userAgent)) {
document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Promise,fetch,Array.prototype.@@iterator"><\/script>');
}
</script>
<!-- your ES6 code -->
<script src="./app.js"></script>
</body>
</html>