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Test Info:

<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<head>
<title>CSS Test: Sticky Positioning - top, stuck</title>
<link rel="author" title="Corey Ford" href="mailto:cford@mozilla.com">
<link rel="match" href="top-3-ref.html">
<meta name="flags" content="dom">
<meta name="assert" content="Sticky-top with scrolling: should move to partially cover static positioned sibling">
<style>
#scroll {
height: 100px;
overflow: hidden;
}
#contain {
height: 300px;
background-color: gray;
}
#sticky {
position: sticky;
top: 10px;
height: 10px;
background-color: black;
}
#static {
height: 10px;
background-color: blue;
}
</style>
</head>
<body>
<div id="scroll">
<div style="height: 20px"></div>
<div id="contain">
<div id="sticky"></div>
<div id="static"></div>
</div>
<div style="height: 100px"></div>
</div>
<script type="application/javascript">
document.getElementById("scroll").scrollTop = 21;
</script>
</body>
</html>