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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div id="outer" style="background-color: red; height: auto;">
<div style="height: 50%; background-color: blue;">
<div style="height: 100%; background-color: green; display: inline-block; vertical-align: top;">Green</div>
<div style="height: 100px; background-color: yellow; display: inline-block; vertical-align: top;">Yellow</div>
</div>
</div>
</body>
</html>