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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom() {
CSS.supports('');
var style = document.createElement("style");
var tn = document.createTextNode("* { border: var(--b); }");
style.appendChild(tn);
document.body.appendChild(style);
}
</script>
</head>
<body onload="boom();"></body>
</html>