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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS test reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
line-height: 1;
color: transparent;
float: left;
clear: left;
}
span {
background: green;
}
</style>
<p>Test passes if the shape below is green and if there is no red.
<div><span>あああ</span></div>
<div><span>ああ</span></div>