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<!DOCTYPE html>
<html>
<head>
<style>
#foo {
height: 50px;
box-sizing: border-box;
}
#bar {
border-bottom-width: 0px;
box-sizing: border-box;
}
</style>
</head>
<body>
<hr id="foo">
<hr id="bar">
</body>
</html>