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Test Info:

<html>↩
<head>↩
<style>↩
html::first-letter { float: right; }↩
html::before { content:"before text"; float:right; }↩
span::before { content:"before text"; float:right; }↩
</style>↩
</head>↩
<body>↩
<span>↩
<div></div>↩
</span>↩
<button onclick="document.body.style.width='100px'">Click</button>↩
</body>↩
</html>↩