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Test Info:

<!DOCTYPE html>
<html>
<head>
<style> * { color: red } </style>
<style id="t"></style>
</head>
<body>
<span class="test">This text should be green</span>
<script>
document.getElementById("t").
appendChild(document.createTextNode("* { color: "));
// Flush reflow
document.body.offsetWidth;
document.getElementById("t").
appendChild(document.createTextNode("green }"));
</script>
</body>
</html>