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chromium/third_party/blink/web_tests/fast/borders/borderRadiusInset01.html 

<html>
<head>
	<style type="text/css">
		div {
			width: 200px;
			height: 200px;
			border: 1px inset #f00;
			-webkit-border-radius: 60px;
			background-color: #0f0;
		}
	</style>
</head>
<body>
	<div>
		&nbsp;
	</div>
</body>
</html>