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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.clamp {
display: block;
padding: 10px;
border: solid 3px;
width: 100px;
}
.clamp div {
border: medium solid green;
padding: 15px;
}
</style>
<div class="clamp">
Line1
<div>Line2…</div>
</div>