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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference file</title>
<style>
div { font-size: 50px; display: inline-block; color: transparent; }
span { background: blue; }
div { line-height: 200px; }
</style>
<p>Test passes if the blue shape below is a rectangle, but not some other polygon.
<div><span>aa</span></div><div><span>aa</span></div><div><span>aa</span></div>