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<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: paint containment use the padding edge</title>
<style>
div {
width: 100px;
height: 100px;
background: blue;
padding: 50px;
border-radius: 100px;
overflow: hidden
}
div::before {
content:"";
display: block;
background: green;
width: 100px;
height: 100px;
}
</style>
<p>Test passes if there is a green square in a rounded blue box, and no red.
<div></div>