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<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that overlay scrollbars are not covered by overlapping non-positioned siblings</title>
#outer {
width: 200px;
height: 200px;
overflow: auto;
background: cyan;
#content {
height: 400px;
/* This test has different behavior depending on the type of scrollbar used.
* We want the scrollbar to be visible. But for non-overlay scrollbars, the
* cover would cover them so we disable the cover.
@media all and (-moz-overlay-scrollbars) {
#cover {
margin-top: -200px;
width: 200px;
height: 200px;
background: cyan;
<div id="outer"><div id="content"></div></div>
<div id="cover"></div>