mozilla-central/testing/web-platform/tests/css/css-round-display/polar-origin-left-bottom-001.html

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<!DOCTYPE html>
<html>
<head>
<title>CSS Test: Origin of Coordinates</title>
<link rel="author" title="Jihye Hong" href="mailto:jh.hong@lge.com" />
<meta name="assert" content="Test checks that the origin of the coordinate system specified with 'polar-origin'." />
<style type="text/css">
.container {
width: 200px;
height: 200px;
border: medium solid black;
}
.item {
position: absolute;
polar-origin: left bottom;
polar-distance: 0px;
polar-angle: 90deg;
width: 50px;
height: 50px;
background-color: red;
}
</style>
</head>
<body>
<p>Test passes if the center of a red box is positioned at the left-side bottom corner of the containing block.<br>
The element is positioned using polar coordinates and the origin of coordinates is the left-side bottom corner of the containing block's left edge.</p>
<div class="container">
<div class="item"></div>
</div>
</body>
</html>