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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>CSS Masking: Test clip-path property and shape function with content-box</title>
<link rel="match" href="reference/clip-path-shape-control-points-ref.html">
<meta name="assert" content="Relative segments in the shape() function can use control points relative to the origin of the reference box.">
</head>
<style>
body {
margin: 0;
}
#shape {
width: 240px;
height: 240px;
padding: 10px;
border: 10px solid red;
box-sizing: border-box;
background-color: green;
/* The size of the content-box is 200x200. */
clip-path: shape(from center left,
curve by 200px 0 with 50% -50% from start / 50% 0 from origin,
curve by -200px 0 with 50% 100% from origin / -50% 50% from start,
close)
content-box;
}
</style>
<body>
<div id="shape"></div>
</body>
</html>