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<!DOCTYPE html>
<style>
div {
position: absolute;
}
#bottom-backdrop {
top: 100px;
left: 100px;
height: 300px;
width: 300px;
background-color: rgb(0, 50, 0);
}
#bottom {
top: 125px;
left: 125px;
height: 250px;
width: 250px;
background-color: rgb(0, 90, 0);
}
#middle-backdrop {
top: 150px;
left: 150px;
height: 200px;
width: 200px;
background-color: rgb(0, 130, 0);
}
#middle {
top: 175px;
left: 175px;
height: 150px;
width: 150px;
background-color: rgb(0, 170, 0);
}
#top-backdrop {
top: 200px;
left: 200px;
height: 100px;
width: 100px;
background-color: rgb(0, 210, 0);
}
#top {
top: 225px;
left: 225px;
height: 50px;
width: 50px;
background-color: rgb(0, 255, 0);
}
</style>
<body>
Test for dialog::backdrop stacking order. The test passes if there are 6
boxes enclosed in each other, becoming increasingly smaller and brighter
green.
<div id="bottom-backdrop"></div>
<div id="bottom"></div>
<div id="middle-backdrop"></div>
<div id="middle"></div>
<div id="top-backdrop"></div>
<div id="top"></div>
</body>