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    <meta charset="utf-8" />
      content="initial-scale=1, maximum-scale=1,user-scalable=no"
     ArcGIS API for JavaScript,
     For more information about the widgets-expand sample,
     read the original sample description at
    <title>Expand widget | Sample | ArcGIS API for JavaScript 4.20</title>

    <script src=""></script>

      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;

      ], function (Map, SceneView, Expand, BasemapGallery) {
        var map = new Map({
          basemap: "satellite"

        var view = new SceneView({
          container: "viewDiv",
          map: map

        // Create a BasemapGallery widget instance and set
        // its container to a div element

        var basemapGallery = new BasemapGallery({
          view: view,
          container: document.createElement("div")

        // Create an Expand instance and set the content
        // property to the DOM node of the basemap gallery widget
        // Use an Esri icon font to represent the content inside
        // of the Expand widget

        var bgExpand = new Expand({
          view: view,
          content: basemapGallery

        view.when(() => {
          bgExpand.expandTooltip = `${bgExpand.label} ${basemapGallery.label}`;

        // close the expand whenever a basemap is selected"activeBasemap", function () {
          var mobileSize =
            view.heightBreakpoint === "xsmall" ||
            view.widthBreakpoint === "xsmall";

          if (mobileSize) {

        // Add the expand instance to the ui

        view.ui.add(bgExpand, "top-right");

    <div id="viewDiv"></div>