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<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that overlay scrollbars are covered by overlapping positioned siblings</title>
#outer {
width: 200px;
height: 200px;
overflow: auto;
background: cyan;
#content {
height: 400px;
#cover {
margin-top: -200px;
width: 200px;
height: 200px;
background: cyan;
position: relative;
<div id="outer"><div id="content"></div></div>
<div id="cover"></div>