<!doctype html>
<html>
<head>
<style type="text/css" media="screen">
#div1
{
width: 150px;
height: 150px;
border:25px dotted;
background-color: green;
}
#div2
{
width: 100px;
height: 100px;
padding: 25px;
background-color: blue;
}
#div3
{
width: 100px;
height: 100px;
background-color: yellow;
}
</style>
</head>
<body>
Test passes if the image below shows nested green, blue and yellow squares with a dotted black border.
<div id="div1"><div id="div2"><div id="div3"></div></div></div>
</body>
</html>