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<!DOCTYPE html>
<html>
<head>
<title>CSS Motion Path: ray() 'sides' size with a fourth-quadrant angle</title>
<style>
#container {
width: 400px;
height: 400px;
}
#target {
position: relative;
left: 200px;
top: 160px;
width: 40px;
height: 40px;
background-color: green;
transform-origin: 0px 0px;
/* ray(315deg sides) from (200,160) hits the top edge: length = 160 / cos(45deg).
With offset-rotate:0 this is a pure translation of length * (sin315, -cos315) = (-160, -160). */
transform: translate(-160px, -160px);
}
</style>
</head>
<body>
<div id="container"><div id="target"></div></div>
</body>
</html>