<!DOCTYPE html>

<html style="display: table;" class="reftest-wait">

<head>
<script>
function boom()
{
  document.documentElement.style.color = "blue";
  document.getElementById("zeta").style.display = "inline";
  
  document.documentElement.removeAttribute("class");
}
</script>
</head>

<body onload="setTimeout(boom, 30);">
  <div id="zeta">foo</div>
</body>

</html>