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Test Info: Warnings

<!doctype html>
<html reftest-async-scroll
reftest-displayport-x="0" reftest-displayport-y="0"
reftest-displayport-w="800" reftest-displayport-h="2000"
reftest-async-scroll-x="0" reftest-async-scroll-y="50">
<head>
<meta charset='utf-8'>
<style type="text/css" media="all">
html {
scrollbar-width: none;
}
.container {
width: 500px;
background: #fcc;
height: 2000px;
}
.header {
position: sticky;
top: 0px;
background: #cfc;
height: 50px;
}
</style>
</head>
<body>
<div class='container'>
<div class='header'></div>
</div>
</body>
</html>