Fetching and displaying data from external REST API

Fetch current ISS location via "Where the ISS at?" API (https://wheretheiss.at/w/developer)

const html = `
    <style>
      body {
            margin: 0;
            padding: 10px;
            background-color: rgba(111, 111, 111, 0.5);
        }
    </style>

  <h1>Current ISS location</h1>
  <p>Latitude: <span id="lat">-</span></p>
  <p>Longitude: <span id="lon">-</span></p>
  <p>Altitude: <span id="alt">-</span>km</p>
  <p><button id="update">Update</button></p>

    <script>
    const url = "https://api.wheretheiss.at/v1/satellites/25544";

      function update() {
        fetch(url).then(r => r.json()).then(data => {
          document.getElementById("lat").textContent = data.latitude;
          document.getElementById("lon").textContent = data.longitude;
          document.getElementById("alt").textContent = data.altitude;
        });
      };

      document.getElementById("update").addEventListener("click", update);

      update();
    </script>
`;

reearth.ui.show(html);

Note that "Where the ISS at?" API is available for Re:Earth plugin, because the API responds with Access-Control-Allow-Origin: * header.