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<!DOCTYPE html>
<title>Reference for reverse running animation</title>
<style>
#box {
background: green;
height: 40px;
width: 40px;
}
</style>
<body>
<div id="box"></div>
<p id="notes">
This test animates the box color from green to red and reverses the play
direction shortly after the midpoint. If the box remains red, the test
failed.
</p>
</body>