index.html

<!DOCTYPE html>
<html>
  <head>
    <meta
      http-equiv="Content-Security-Policy"
      content="default-src 'self' nativeimage: 'unsafe-inline' apple.com"
    />
    <script>
      console.log("trying fetch");
      fetch("https://apple.com").then((blah) => {
        console.log("fetched: " + blah);
      });
    </script>
    <title>Title</title>
    <link rel="canonical" href="https://paultiarks.github.io/SWTest/" />
    <style type="text/css">
      /* --- application CSS here --- */
      * {
        background-color: #f5f4f0;
        font-family: Georgia, serif;
      }
    </style>
  </head>

  <body>
    <h1>Content</h1>
    <script>
      // register ServiceWorker, remember to use absolute path!

      // --- Application code here ---
    </script>
    <img src="nativeimage://testImage.jpg" width="300" height="168" />
  </body>
</html>