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<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
margin: 10px;
background-color: black;
rotate: 90deg;
}
div:after {
position: absolute;
content: "";
width: 50px;
height: 50px;
background-color: gray;
}
#unspecifed-to {
rotate: 270deg;
}
</style>
</head>
<body>
<div id="explicit-from-and-to"></div>
<div id="unspecifed-from"></div>
<div id="base-value-from"></div>
<div id="unspecifed-to"></div>
<div id="base-value-to"></div>
</body>
</html>