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<!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">
<style>
html {
scrollbar-width: none;
}
body {
height: 4000px;
margin: 0;
}
#sticky {
position: sticky;
top: -1000px; /* scrolls regularly until the top edge hits -1000px, then stays fixed */
height: 1200px;
border-bottom: 1px solid black;
}
#fixed {
position: fixed;
top: 50px;
left: 50px;
width: 100px;
height: 100px;
box-sizing: border-box;
border: 1px solid blue;
}
</style>
<div id="sticky">
<div id="fixed"></div>
</div>
</html>
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