I am using this jquery popup plugin from this link on my WordPress site. It's working fine on all browsers but giving the following error on IE11.
Jquery – Getting Error: Object doesn’t support property or method ‘assign’
jquerymodal-dialogpopupWordpress
Best Answer
As others have mentioned, the Object.assign() method is not supported in IE, but there is a polyfill available, just include it "before" your plugin declaration:
From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
Test page: http://jsbin.com/pimixel/edit?html,js,output (just remove the polyfill to get the same error you're getting on your page).