<!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, contain applies
* decrease, so that the new length is -25px (-150px / 2).
* Note: offset-anchor is "200% -300%", and ray angle is -90deg
and offset-rotate is -90deg.
*/
transform: translate(-75px, -12.5px) rotate(-90deg) translate(-225px, 87.5px);
}
</style>
</head>
<body>
<div id="container">
<div id="target"></div>
</div>
</body>
</html>