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Test Info:

<!DOCTYPE html>
<html>
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<style>
.container {
background: green;
width: 100px;
height: 100px;
overflow: auto;
}
.float {
float: left;
position: relative;
width: 50px;
height: 50px;
top: calc(50% - 100vh);
transform: translateY(-50%) translateY(100vh);
}
</style>
<p>Test passes if there is a filled green square.</p>
<div class="container">
<div class="float"></div>
</div>