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<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<style>
div#details {
background-color: orange;
overflow: auto;
width: 300px;
height: 200px;
}
div#summary {
background-color: green;
overflow: auto;
width: 200px;
height: 100px;
}
div.tall {
background-color: blue;
border: 1px dotted purple;
height: 1000px;
width: 50px;
}
</style>
<body>
<div id="details">
<div id="summary">
<div class="tall">
</div>
</div>
<div class="tall">
</div>
</div>
</body>
</html>