css/css-round-display/polar-origin-and-anchor-004.html

<!DOCTYPE html>
<html>
	<head>
		<title>CSS Test: Position an element with 'polar-origin' and 'polar-anchor'</title>
		<link rel="author" title="Jihye Hong" href="mailto:jh.hong@lge.com" />
		<link rel="help" href="https://www.w3.org/TR/motion-1/#motion-paths-overview/">
		<meta name="assert" content="Test checks that the position of an element specified with 'polar-origin' and 'polar-anchor'.">
		<style type="text/css">
		    .container {
		      width: 200px;
		      height: 200px;
		      border: medium solid black;
		    }
		    .item {
		      position: absolute;
		      polar-origin: bottom;
		      polar-anchor: left top;
		      polar-distance: 0px;
			  polar-angle: 90deg;
		      width: 50px;
		      height: 50px;
		      background-color: red;
		    }
		  </style>
	</head>
	<body>
		<p>Test passes if the upper left corner of the red box is positioned at the center point of the containing block's bottom edge.<br>
		The element is positioned using polar coordinates.<br>
		The origin of coordinates is the center point of the containing block's bottom edge.<br>
		And the anchor point of the element is at its upper left corner.</p>
		<div class="container">
			<div class="item"></div>
		</div>
	</body>
</html>