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<!DOCTYPE html>
<style>
#backdrop {
position: absolute;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background: green;
}
</style>
<body>
Test that position 'static' or 'relative' for ::backdrop computes to 'absolute'.
The test passes if there is a single green box.
<div id="backdrop"></div>
</body>