dist/samples/map-sync/inline.html

<!DOCTYPE html>
<html>
  <head>
    <title>Synchronous Loading</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&v=weekly"></script>
    <script>
      const map = new google.maps.Map(document.getElementById("map"), {
        center: { lat: -34.397, lng: 150.644 },
        zoom: 8,
      });
    </script>
  </body>
</html>