Adding a Leaflet marker with a popup

Add a Leaflet marker with a popup.

<!DOCTYPE HTML>
<html>
  <head>
    <script src="https://unpkg.com/wrld.js@1.x.x"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.1/leaflet.css" rel="stylesheet" />
  </head>
  
  <body>
  <div style="position: relative">
    <div id="map" style="height: 400px"></div>
    <script>
      var map = Wrld.map("map", "your_api_key_here", {
        center: [37.7950, -122.401],
        zoom: 15
      });

      var marker = Wrld.marker([37.7952, -122.4028], {
        elevation: 260.0,
        title: "Transamerica Pyramid"
      }).addTo(map);

      marker.bindPopup("This is the Transamerica Pyramid").openPopup();
    </script>
  </div>
  </body>
</html>