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MapView.js "Object doesn't support this action" - Internet Explorer 11 and JSAPI 4.8

Question asked by csgeosol1 Champion on Sep 17, 2018
Latest reply on Sep 18, 2018 by csgeosol1

Hello all,


Is there a known issue with IE 11 and v4 of the JSAPI? Specifically, I stripped everything out of my application and found there is an issue with MapView, for IE, but not Chrome:


<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>IE Issue</title>
.embeddedMaps {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
<link rel="stylesheet" href="">
<script src=""></script>
], function (Map,
) {
const map = new Map({
basemap: "gray-vector"

const view = new MapView({
container: "myMapContainer",
map: map,
zoom: 9,
center: [-82.457, 27.95]
<div class="embeddedMaps" ID="myMapContainer"/>


IE is reporting the issue in MapView.js on line 806:


SCRIPT445: Object doesn't support this action


g(function () {
       d.dispatchEvent(new MessageEvent("message", { //error here...
             data : b


It seems it's choking on MessageEvent(), but according to MessageEvent - Web APIs | MDN  - it is supported.


Any ideas? This is a big deal for us as IE support is REQUIRED for our app, unfortunately. This IS working in Edge, it appears.