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<!DOCTYPE html>
<html reftest-async-scroll>
<style>
body {
height: 100vh;
margin: 0px;
}
#scrollbox {
width: 100%;
height: 100%;
overflow: scroll;
scrollbar-width: none;
}
#scrolledContents {
height: 10000px;
background: radial-gradient(circle, blue 30%, transparent 0);
background-size: 80px 80px;
}
</style>
<body>
<div id="scrollbox"
reftest-dislayport-x="0" reftest-displayport-y="0"
reftest-displayport-w="800" reftest-displayport-h="2000"
reftest-async-scroll-x="0" reftest-async-scroll-y="20">
<div id="scrolledContents"></div>
</div>
</body>
</html>