Display a popup

Create and display a popup of feature layer attributes on a map. For more explanation, visit the Display a popup tutorial.
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<html>
  <head>
    <meta charset="utf-8" />
    <title>Display a popup (feature layers)</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>

    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@3.0.12/dist/esri-leaflet.js"></script>

    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.2.5/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map").setView([37.837, -122.479], 8);

      L.esri.Vector.vectorBasemapLayer("arcgis/modern-antique", {
        token: accessToken
      }).addTo(map);

      const earthquakes = L.esri
        .featureLayer({
          url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Earthquakes_Since1970/MapServer/0"
        })
        .addTo(map);

      earthquakes.bindPopup(function (layer) {
        return L.Util.template(
          "<p>Earthquake <strong>{name}</strong> occured on {mo}/{dy}/{year_}.  It had a magnitude of {magnitude}.</p>",
          layer.feature.properties
        );
      });
    </script>
  </body>
</html>