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<!DOCTYPE html>
<style>
.fieldset {
border: 2px solid gray;
margin: 1em;
padding: 0;
width: 20em;
}
.f1 {
overflow: auto;
max-height: 3em;
}
.f2 {
max-height: 0;
}
</style>
<div class="fieldset f1">
<div>foo</div>
<div>foo</div>
<div>foo</div>
<div>foo</div>
<div>foo</div>
</div>
<div class="fieldset f1">
<div>foo</div>
</div>
<div class="fieldset f2">
<div>foo</div>
</div>