nt.querySelectorAll('select');

const span0 = document.createElement('span');
selects[0].options[0].appendChild(span0);

const span1 = document.createElement('span');
selects[1].options[0].appendChild(span1);

document.documentElement.addEventListener('TestRendered', e => {
  span0.textContent = 'foo';
  span1.textContent = 'bar';
  e.target.removeAttribute('class');
});
</script>
</body>
</html>
