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<!DOCTYPE html>
<html>
<head>
<style>
.backdrop {
position: absolute;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background-color: green;
}
</style>
</head>
<body>
Test dynamic changes to ::backdrop style. The test passes if there is a green box below.
<div class="backdrop"></div>
</body>
</html>