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Test Info:

<!DOCTYPE html>
<html><head>
<meta charset="UTF-8">
<style>
body { column-count: 2; }
div::after { content: "A"; }
</style>
<script>
function boom() {
x.style.display = "contents";
}
</script>
</head>
<body onload="boom();"><div></div><div><div id="x"></div></div></body>
</html>