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<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that overlay scrollbars are covered by positioned siblings with higher z-index even when the scrollable frame has a positioned descendant</title>
#outer {
width: 200px;
height: 200px;
overflow: auto;
#content {
height: 400px;
background: cyan;
position: relative;
z-index: 1;
#cover {
width: 200px;
height: 200px;
background: cyan;
position: absolute;
z-index: 2;
<div id="cover"></div>
<div id="outer"><div id="content"></div></div>