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Test Info:

<!DOCTYPE html>
<html>
<head>
<style id=z></style>
<script>
o1 = document.createElement('embed');
document.getElementById('z').scrollLeft;
document.styleSheets[0].insertRule("* { flex-basis: calc(1rem) }", 0);
try { window.find("a", true, true, false, false, true, false); } catch(e) {};
document.replaceChild(o1, document.documentElement);
document.documentElement.appendChild(document.createElement('style'));
document.styleSheets[0].insertRule("* { font: small roman inherit }", 0);
</script>
</head>
</html>