<!DOCTYPE html>
<html class="reftest-wait">
<body>
<script>
addEventListener("DOMContentLoaded", function() {
  let a = document.createElement("th");
  document.documentElement.appendChild(a);
  a.animate([{"mask": "repeat-y "}], 484);
  document.documentElement.classList.remove("reftest-wait");
});
</script>
</body>
</html>
