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Test Info:

<!DOCTYPE html>
<title>Overflow:scroll paint order</title>
<link rel="help" href="https://www.w3.org/TR/CSS2/zindex.html">
<link rel="match" href="overflow-scroll-paint-order-ref.html">
<style>
#scroller {
background: red;
padding: 20px;
box-sizing: border-box;
width: 100px;
height: 100px;
overflow: scroll;
}
#negative-margin {
width: 100px;
height: 100px;
background: green;
margin-top: -100px;
}
#foreground1 {
display: inline-block;
width: 50px;
height: 50px;
background: blue;
}
#foreground2 {
display: inline-block;
width: 50px;
height: 50px;
background: magenta;
}
</style>
<!-- The paint order should be:
scroller background (invisible)
scroller child background (invisible)
negative-margin background (visible)
foreground1 (visible)
foreground2 (visible)
-->
<div id="scroller">
<div style="height: 200px; background: yellow">
<div id="foreground1"></div>
</div>
</div>
<div id="negative-margin">
<div id="foreground2"></div>
</div>