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<!DOCTYPE html>
<html lang="en" reftest-async-scroll>
<meta charset="utf-8">
<title>Make sure the scrolled layer is opaque even if the scrolled area is fractional</title>
<style>
body {
margin: 0;
}
.scrollbox {
margin: 50px;
width: 200px;
height: 200px;
overflow: auto;
/* Make the background "non-uniform" so that the scrolled layer does not
* pull up a background color. */
background: linear-gradient(to bottom, white, transparent);
}
.scrolled-contents {
height: 300.2px;
background-color: lime;
box-sizing: border-box;
border: 1px solid lime;
}
.transparent-overlap-of-fractional-edge {
margin: -10px 20px 0;
height: 40px;
background-color: rgba(0, 0, 255, 0.5);
}
</style>
<body>
<div class="scrollbox"
reftest-displayport-x="0" reftest-displayport-y="-100.2"
reftest-displayport-w="200" reftest-displayport-h="300.2"
reftest-async-scroll-x="0" reftest-async-scroll-y="0">
<div class="scrolled-contents">
<div class="transparent-overlap-of-fractional-edge reftest-opaque-layer">
<!-- This element has the magic "reftest-opaque-layer" class which
constitutes the actual test here. -->
</div>
</div>
</div>
<script>
document.querySelector(".scrollbox").scrollTop = 100000; /* will end up at 100.2 */
</script>
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