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<!DOCTYPE html>
<html>
<head>
<title>CSS Motion Path: ray paths with contain</title>
<style>
#container {
width: 250px;
height: 250px;
transform: translate(100px);
}
#target {
position: relative;
left: 50px;
top: 50px;
width: 150px;
height: 25px;
background-color: lime;
/*
* The original path length is 50px, which is not enough to contain
* the element entirely, so it should be increased.
* "75px" is just the center of the element, which makes the path
* length increase minimally.
* Besides, -75px = (-150px * 2) + 225px, the used offset distance is
* -225px in this case.
* Note: offset-anchor is "200% -300%", and ray angle is -90deg.
*/
transform: translate(calc(-75px), calc(25px * 3));
}
</style>
</head>
<body>
<div id="container">
<div id="target"></div>
</div>
</body>
</html>
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