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Test Info:
<!DOCTYPE html>
<html>
<head>
<style>
div:empty { background: yellow; border: 1px solid black;
padding: 0; margin: 0; }
body > div:not(:empty) { height: 20px; }
</style>
</head>
<body>
<div style="height: 10px;"></div>
<div style="height: 5px;"></div>
<div style="height: 5px;"></div>
<div style="height: 15px;"></div>
<div style="height: 15px;"></div>
<div>
<div style="height: 10px;"></div>
</div>
<div>
<div style="height: 10px;"></div>
</div>
<div>
<div style="height: 5px;"></div>
</div>
<div>
<div style="height: 10px;"></div>
</div>
<div>
<div style="height: 2px;"></div>
</div>
<div style="padding: 10px 0;">
<div style="height: 10px;"></div>
</div>
<div style="padding: 10px 0;">
<div style="height: 2px;"></div>
</div>
<div style="border-width: 10px 0; border-style: solid;
border-color: transparent;">
<div style="height: 10px;"></div>
</div>
<div style="border-width: 10px 0; border-style: solid;
border-color: transparent;">
<div style="height: 2px;"></div>
</div>
</body>
</html>