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POWhy would margin not be contained by parent element?
 

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  1. POWhy would margin not be contained by parent element?
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    <p>When an element with a margin is contained within another element, the parent does not consistently wrap that margin.</p> <p>Many things will cause the parent to wrap the child's margin:</p> <ul> <li>border:solid;</li> <li>position:absolute;</li> <li>display:inline-block;</li> <li>overflow:auto</li> </ul> <p>(And this just from small testing, no doubt there is more.)</p> <p>I would assume this has to do with collapsing margins, but:</p> <ol> <li>The W3C spec page has no description of such behavior.</li> <li>There is no overlapping margins here.</li> <li>Behavior of all browsers seems to be consistent on this issue.</li> <li>The behavior is affected by triggers that are not related to the margins </li> </ol> <p>What is the logic by which an element which defaults to overflow:auto should contain different material than the one where the overflow is set to auto.</p> <p>Why should everything but the default behavior of a regular div assume that the margin is contained by the parent - and why should the regular default not include the margin?</p> <p>EDIT: The final answer is that the W3C really does specify this behavior, but that</p> <ul> <li>The specs do not really make any sense.</li> <li><a href="http://blog.siteroller.net/collapsed-margins-and-free-margins" rel="noreferrer">The specs mix, without any word of explanation</a>: <ul> <li>'free margins' (margins that would touch the top or bottom of their parent are not contained by the parent) and</li> <li>'collapsed margins' (adjacent margins are allowed to overlap).</li> </ul></li> </ul> <p>Demo:</p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Margins overextending themselves&lt;/title&gt; &lt;meta http-equiv="Content-Type" content="text/html;charset=utf-8" &gt; &lt;style type="text/css"&gt; body{ margin:0; } div.b{ background-color:green; } div.ib{ display:inline-block; background-color:red; } div.pa{ background-color:yellow; position:absolute; bottom:0; right:0; } div.oa{ background-color:magenta; overflow:auto; } div.brdr{ background-color:pink; border:solid; } h1{margin:100px; width:250px; border:solid;} &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div class="b"&gt; &lt;h1&gt;Is the margin contained?&lt;/h1&gt; &lt;/div&gt; &lt;div class="ib"&gt; &lt;h1&gt;Is the margin contained?&lt;/h1&gt; &lt;/div&gt; &lt;div class="pa"&gt; &lt;h1&gt;Is the margin contained?&lt;/h1&gt; &lt;/div&gt; &lt;div class="oa"&gt; &lt;h1&gt;Is the margin contained?&lt;/h1&gt; &lt;/div&gt; &lt;div class="brdr"&gt; &lt;h1&gt;Is the margin contained?&lt;/h1&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt;` </code></pre>
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    1. COI dont understand what you are asking. Are you asking why the h1 elements display inside the container elements? Please be clearer with your question.
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      1. USAntony Carthy
 

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