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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="100">
<style>
html {
scrollbar-width: none;
}
#section {
padding-top: 1px;
}
#header {
position: sticky;
top: 0;
}
#header > div {
margin-top: -50px;
border: solid blue 2px;
height: 100px;
width: 100px;
}
#spacer {
height: 1500px;
}
</style>
<div id="section">
<div id="header">
<div></div>
</div>
<div id="spacer"></div>
</div>
</html>