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<!DOCTYPE html>
<html>
<head>
<style>
.test {
display: inline-block;
margin: 20px;
width: 300px;
height: 150px;
box-sizing: border-box;
border: 50px solid blue;
border-right-style: hidden;
}
</style>
</head>
<body>
<div class="test"></div>
</body>
</html>