index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Forge-Extensions-Example</title>
    <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1, user-scalable=no"/>
    <meta charset="UTF-8">

    <!-- Autodesk Forge Viewer files -->
    <link rel="stylesheet" href="https://developer.api.autodesk.com/modelderivative/v2/viewers/7.*/style.min.css" type="text/css">
    <script src="https://developer.api.autodesk.com/modelderivative/v2/viewers/7.*/viewer3D.min.js"></script>


    <!-- Developer CSS -->
    <link rel="stylesheet" href="./assets/css/main.css"/>
    <!-- Developer JS -->
    <script src="./assets/js/app.js"></script>

</head>

<body>
<div id="MyViewerDiv"></div>
</body>
<script>
    let divId = "MyViewerDiv";
    let documentId = "urn:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6dW5pdmVyc2FsLXJvYm90cy9VUjMuZjNk";
    let tokenFetchingUrl = "https://fg9ysg979c.execute-api.ca-central-1.amazonaws.com/prod/";
    let extensionArray = [];
    setupViewer(divId, documentId, tokenFetchingUrl, extensionArray);
</script>
</html>