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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>CSS Overflow: test reference</title>
<style>
.clamp {
background-color: yellow;
}
.zero {
height: 0;
}
</style>
<div class="clamp">
Line 1<br>
Line 2<br>
Line 3<br>
Line 4<br>
<div class=zero>
Line 5<br>
Line 6…
</div>
</div>