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Test Info:

<!DOCTYPE html>
<html>
<head>
<style type="text/css"> :root { filter: url('#g'); } </style>
<style type="text/css" id="ccs"> .cc { content: 'X'; } </style>
</head>
<body onload="document.getElementById('ccs').disabled = true;">
<div id="g"></div>
<div class="cc">5</div>
</body>
</html>