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I run into this problem quite often with Firefox only. My code is below, but what is actually happening in the browser is different (see screenshots from Firebug and Webkit inspector). As you can see, the <b>&lt;h2&gt;</b> is displaying inside the <b>&lt;dd&gt;</b> just fine, but the <b>&lt;h3&gt;</b> is jumping outside of the <b>&lt;dt&gt;</b>. Why?<br />
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<pre><code id="code-2080960">&lt;div class=&quot;meta&quot;&gt;
  &lt;dl&gt;
    &lt;dt class=&quot;label&quot;&gt;&lt;h3&gt;Label&lt;/h3&gt;&lt;/dt&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Lorem&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Ipsum&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Dolor&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Sit&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Amet&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Laborem&lt;/a&gt;&lt;/h2&gt;&amp;#44;&lt;/dd&gt;
    &lt;dt class=&quot;label&quot;&gt;&lt;h3&gt;Label&lt;/h3&gt;&lt;/dt&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Lorem&lt;/a&gt;&amp;#44;&lt;/h2&gt;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Ipsum&lt;/a&gt;&amp;#44;&lt;/h2&gt;&lt;/dd&gt;
      &lt;dd&gt;&lt;h2&gt;&lt;a href=&quot;&quot;&gt;Dolor&lt;/a&gt;&amp;#44;&lt;/h2&gt;&lt;/dd&gt;
    &lt;dt class=&quot;label&quot;&gt;&lt;h3&gt;Label&lt;/h3&gt;&lt;/dt&gt;
      &lt;dd&gt;Lorem&lt;/dd&gt;
    &lt;dt class=&quot;label&quot;&gt;&lt;h3&gt;Label&lt;/h3&gt;&lt;/dt&gt;
      &lt;dd&gt;Ipsum&lt;/dd&gt;
    &lt;dt class=&quot;label&quot;&gt;&lt;h3&gt;Label&lt;/h3&gt;&lt;/dt&gt;
      &lt;dd&gt;Dolor&lt;/dd&gt;
  &lt;/dl&gt;
&lt;/div&gt;
</code></pre>
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<a href="https://filedb.experts-exchange.com/incoming/2010/11_w47/371813/firebug.png" target="_blank" title="firebug (49 KB)"><img alt="firebug" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2010/11_w47/800_371813/firebug.png" /></a> <br />
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<a href="https://filedb.experts-exchange.com/incoming/2010/11_w47/371814/webkit.png" target="_blank" title="webkit (33 KB)"><img alt="webkit" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2010/11_w47/800_371814/webkit.png" /></a>
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firebug.png

webkit.png

I run into this problem quite often with Firefox only. My code is below, but what is actually happening in the browser is different (see screenshots from Firebug and Webkit inspector). As you can see, the <h2> is displaying inside the <dd> just fine, but the <h3> is jumping outside of the <dt>. Why?

 

 



Firefox incorrectly rendering Elements outside of Parent

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.