<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
html {
    color: orange;
}
</style>

<script>
function boom()
{
  document.documentElement.offsetHeight;
  document.getElementById("hostW").attachShadow({ mode: "open" }).innerHTML = '<z></z>';
  document.getElementsByTagName("style")[0].remove();
}
</script>

</head>

<body onload="boom();"><div style="display: contents;" id="hostW"></div></body>

</html>
