'Promise' is undefined in IE11 - popup

Question

I have used this plugin to create popups in the Divi website I have built:
https://wordpress.org/plugins/popups-for-divi/
The popups were not opening in IE because of the padStart() function and I found an alternative to replace the padStart() function using this code:
<
script >
if (!String.prototype.padStart) {
String.prototype.padStart = function padStart(targetLength, padString) {
targetLength = targetLength >> 0; //truncate if number or convert non-number to 0;
padString = String((typeof padString !== 'undefined' ? padString : ' '));
if (this.length > targetLength) {
return String(this);
} else {
targetLength = targetLength - this.length;
if (targetLength > padString.length) {
padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
}
return padString.slice(0, targetLength) + String(this);
}
};
} <
/script>
Now the problem is, the popups are loading fine on Homepage but not on other pages and I am getting this error:
'Promise' is undefined
Can anyone help me get this problem resolved? This is the link to the website to check:
https://site2.stagging.tk/
Thanks

Answer 1

I was able to resolve this problem by adding these two lines of code in the Header:
<script src="https://unpkg.com/es6-promise/dist/es6-promise.auto.min.js"></script>
<script src="https://unpkg.com/unfetch/polyfill/index.js"></script>
Thanks