chromium/third_party/blink/web_tests/css3/masking/clip-path-circle.html

<!DOCTYPE html>
<html lang="en">
<head>
<style>
div {
    width: 200px;
    height: 200px;
    background-color: green;
    -webkit-clip-path: circle(100px at 100px 100px);
}
</style>
</head>
<body>
<div>
</body>
</html>