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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS test reference</title>
<style>
div { white-space: pre; }
span { background: blue; }
</style>
<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
<div>ああ<span> </span><br>ああ</div>