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    <p><code>.clearfix</code> is defined in <a href="https://github.com/twbs/bootstrap/blob/v2.3.0/less/mixins.less"><code>less/mixins.less</code></a>. Right above its definition is a comment with a link to this article:</p> <p><a href="http://nicolasgallagher.com/micro-clearfix-hack/">A new micro clearfix hack</a></p> <p>The article explains how it all works.</p> <p><strong>UPDATE:</strong> Yes, link-only answers are bad. I knew this even at the time that I posted this answer, but I didn't feel like copying and pasting was OK due to copyright, plagiarism, and what have you. However, I now feel like it's OK since I have linked to the original article. I should also mention the author's name, though, for credit: Nicolas Gallagher. Here is the meat of the article (note that "Thierry’s method" is referring to <a href="http://www.yuiblog.com/blog/2010/09/27/clearfix-reloaded-overflowhidden-demystified/">Thierry Koblentz’s “clearfix reloaded”</a>):</p> <blockquote> <p>This “micro clearfix” generates pseudo-elements and sets their <code>display</code> to <code>table</code>. This creates an <a href="http://www.w3.org/TR/CSS2/tables.html#anonymous-boxes">anonymous table-cell</a> and a new block formatting context that means the <code>:before</code> pseudo-element prevents top-margin collapse. The <code>:after</code> pseudo-element is used to clear the floats. As a result, there is no need to hide any generated content and the total amount of code needed is reduced.</p> <p>Including the <code>:before</code> selector is <em>not</em> necessary to clear the floats, but it <strong>prevents</strong> top-margins from collapsing in modern browsers. This has two benefits:</p> <ul> <li><p>It ensures visual consistency with other float containment techniques that create a new block formatting context, e.g., <code>overflow:hidden</code></p></li> <li><p>It ensures visual consistency with IE 6/7 when <code>zoom:1</code> is applied.</p></li> </ul> <p><strong>N.B.</strong>: There are circumstances in which IE 6/7 will not contain the bottom margins of floats within a new block formatting context. Further details can be found here: <a href="http://nicolasgallagher.com/better-float-containment-in-ie/">Better float containment in IE using CSS expressions</a>.</p> <p>The use of <code>content:" "</code> (note the space in the content string) avoids an <a href="http://codepen.io/anon/full/9454/4">Opera bug</a> that creates space around clearfixed elements if the <code>contenteditable</code> attribute is also present somewhere in the HTML. Thanks to Sergio Cerrutti for spotting this fix. An alternative fix is to use <code>font:0/0 a</code>.</p> <h1>Legacy Firefox</h1> <p>Firefox &lt; 3.5 will benefit from using Thierry’s method with the addition of <code>visibility:hidden</code> to hide the inserted character. This is because legacy versions of Firefox need <code>content:"."</code> to avoid extra space appearing between the <code>body</code> and its first child element, in certain circumstances (e.g., <a href="http://jsfiddle.net/necolas/K538S/">jsfiddle.net/necolas/K538S/</a>.)</p> <p>Alternative float-containment methods that create a new block formatting context, such as applying <code>overflow:hidden</code> or <code>display:inline-block</code> to the container element, will also avoid this behaviour in legacy versions of Firefox.</p> </blockquote>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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