<html>
  <head>
    <meta charset="utf-8" />
    <title>Hello, world!</title>
    <meta name="viewport" content="initial-scale=1.0" />
  </head>
  <body style="height: 100%">
    <p>Hello, world!</p>
    <script>
      document.body.addEventListener("click", () => {
        navigator.clipboard
          .readText()
          .then(() => {
            window.alert("allow");
          })
          .catch(() => {
            window.alert("deny");
          });
      });
    </script>
  </body>
</html>
