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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Rotated buffer with mask</title>
<style>
body {
margin: 0;
}
.outer {
padding: 50px;
}
.scrollbox {
width: 200px;
height: 200px;
overflow: auto;
}
.scrolled {
box-sizing: border-box;
border: 1px solid transparent;
height: 200px;
}
</style>
<div class="outer">
<div class="scrollbox">
<div class="scrolled" style="background-color: blue;"></div>
<div class="scrolled" style="background-color: lime;"></div>
</div>
</div>
<script>
var scrollbox = document.querySelector(".scrollbox");
scrollbox.scrollTop = 199;
</script>