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<!DOCTYPE html>
<link rel="match" href="backdrop-stacking-order-ref.html">
<link rel="help" href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
<style>
dialog {
padding: 0px;
border: none;
margin: 0px;
outline: none;
}
#bottom::backdrop {
top: 100px;
left: 100px;
height: 300px;
width: 300px;
background-color: rgb(0, 50, 0);
z-index: 100; /* z-index has no effect. */
}
#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);
z-index: -100; /* z-index has no effect. */
}
#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);
z-index: 0; /* z-index has no effect. */
}
#top {
top: 225px;
left: 225px;
height: 50px;
width: 50px;
background-color: rgb(0, 255, 0);
z-index: -1000; /* z-index has no effect. */
}
</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.
<dialog id="top"></dialog>
<dialog id="middle"></dialog>
<dialog id="bottom"></dialog>
<script>
var topDialog = document.getElementById('top');
var middleDialog = document.getElementById('middle');
var bottomDialog = document.getElementById('bottom');
topDialog.showModal();
bottomDialog.showModal();
topDialog.close(); // Just to shuffle the top layer order around a little.
middleDialog.showModal();
topDialog.showModal();
</script>
</body>
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