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Test Info:

<html><head>↩
<style>↩
*::first-line { }↩
*::after { content:"anonymous text"; }↩
*::before { content:"before text"; }↩
</style>↩
</head>↩
<body>↩
<ol style="overflow: hidden; float: right; column-count: 3;">↩
<span style="overflow: auto; float: left;"></span>↩
</ol>↩
</body>↩
</html>