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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
display: flow-root;
font: 16px / 32px serif;
white-space: pre;
padding: 0 4px;
background-color: yellow;
}
.with-height {
height: 3lh;
background-color: orange;
}
</style>
<div class="clamp">Line 1
Line 2
Line 3
Line 4
<div class="with-height">Line 5
Line 6…</div></div>