gecko-dev/layout/reftests/position-sticky/overcontain-1.html

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<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
- http://creativecommons.org/publicdomain/zero/1.0/ -->
<html>
<head>
<title>CSS Test: Sticky Positioning - containment and normal position</title>
<link rel="author" title="Corey Ford" href="mailto:cford@mozilla.com">
<link rel="match" href="overcontain-1-ref.html">
<meta name="assert" content="Keeping the element's margin box within the containing block's content box should never move the element back past its normal position">
<style>
body {
margin: 0;
}
#sticky {
position: sticky;
top: 10px;
height: 10px;
margin-bottom: 10px;
background-color: black;
}
</style>
<body>
<div id="sticky"></div>
</body>
</html>