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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Reftest Reference</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<style>
div
{
height: 100px;
position: relative;
width: 100px;
}
div#outer-black
{
background-color: black;
left: 90px;
top: 90px;
}
div#middle-orange
{
background-color: orange;
bottom: 30px;
right: 30px;
}
div#inner-blue
{
background-color: blue;
bottom: 30px;
right: 30px;
}
</style>
<p>Test passes if a blue box overlaps an orange box, which overlaps a black box.
<div id="outer-black">
<div id="middle-orange">
<div id="inner-blue"></div>
</div>
</div>