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>