block-in-inline-zero-height-margin-collapse-ref.html

Enable keyboard shortcuts

<!DOCTYPE html>

<title>CSS Reference</title>

<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">

<style>

.container { width: 100px; font: 20px/1 Ahem; }

.before { width: 100px; height: 20px; background: green; }

.gap { width: 100px; height: 40px; background: white; }

.after { width: 100px; height: 20px; background: green; }

</style>

<p>Two green squares with a 40px gap; no red.</p>

<div class="container">

    <div class="before"></div>

    <div class="gap"></div>

    <div class="after"></div>

</div>