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Test Info:

<!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>