csstdg5figs/07-padding-borders-outlines-and-margins/margins_collapsing.html at main · meyerweb/csstdg5figs · GitHub

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
			"http://www.w3.org/TR/REC-html40/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Collapsing margins</title>
<link rel="stylesheet" type="text/css" href="c/pbom-baseline.css">
<style type="text/css">
div {border: 1px dashed;}
	p {margin: 10%; background-color: silver;}
</style>
</head>
<body>


<div style="width: 600px;">
	<p>
		This paragraph is contained within a DIV that has a width of 600 pixels, so its margin will be 10% of the width of the paragraph's parent element. Given the declared width of 600 pixels, the margin will be 60 pixels on all sides.
	</p>
</div>
<div style="width: 300px; margin-top: -31px;">
	<p>
		This paragraph is contained within a DIV with a width of 300 pixels, so its margin will still be 10% of the width of the paragraph's parent. There will, therefore, be half as much margin on this paragraph as on the first paragraph.
	</p>
</div>

</body>
</html>