sessionStorage? It fails
Testing if Googlebot can use the sessionStorage api. There is a script in the head that sets a value in sessionStorage:
<script>
      sessionStorage.setItem('ttbTest', 'It Works');
      </script>There is then another script at the bottom of the page that takes this value, and changes the innerText of the results span.
<script>
      let result = sessionStorage.getItem('ttbTest');
      document.getElementById("result").innerText = result;
      </script>