block-in-inline-margin-collapses-through-intervening-float-ref.html

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<!DOCTYPE html>

<title>CSS Reference</title>

<style>

.container { width: 200px; }

.first { width: 200px; height: 20px; margin-bottom: 40px; background: blue; }

.intervening { float: left; width: 80px; height: 60px; background: yellow; }

.second { width: 200px; height: 20px; background: blue; }

</style>

<p>Two blue rectangles separated by a 40px gap; a yellow float intersects the second.</p>

<div class="container">

    <div class="first"></div>

    <div class="intervening"></div>

    <div class="second"></div>

</div>