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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
o1 = document.createElement('style');
o1.textContent = "* { position: absolute; }";
o1.className = 'c2';
document.head.appendChild(o1);
document.styleSheets[0].insertRule("*::first-line { border-inline-end-style: solid; }", 0);
document.styleSheets[0].insertRule("* { display: table-row ; }", 0);
document.styleSheets[0].insertRule(".c2::first-line { border-style: none ; }", 0);
</script>
</head>
</html>