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Test Info:
<html>↩
<head>↩
<style>↩
hr::before { content:"b"; float:right;}↩
</style>↩
</head>↩
<body>↩
<hr style="column-count: 1;">↩
</html>
<html>↩
<head>↩
<style>↩
hr::before { content:"b"; float:right;}↩
</style>↩
</head>↩
<body>↩
<hr style="column-count: 1;">↩
</html>