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css - <div></div> vs <div />

I am trying to understand why is there a difference in how a browser displays <div></div> verses <div />?

Here is an example: The expected output of snippet #1 is three boxes, side by side: [black], [blue], [red]. Snippet #2 only displays [black] and [red] - Why isn't the [blue] box rendered in snippet #2?

1:

<div style="float:left; width:50px; height:50px; background:black;"></div>

<div style="float:left; width:50px; height:50px; background:blue;"></div>

<div style="float:left; width:50px; height:50px; background:red;"></div>

2:

<div style="float:left; width:50px; height:50px; background:black;"></div>

<div style="float:left; width:50px; height:50px; background:blue;" />

<div style="float:left; width:50px; height:50px; background:red;"></div>

Edit: I am using Chrome 12 & html5: <!doctype html>

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Mainly because <div /> is not valid HTML.

If you have a look through the different doctypes you'll notice that div cannot be self closing.

According to the W3C:

A div element must have both a start tag and an end tag.

Source: http://www.w3.org/TR/html-markup/div.html

To include Chucks comment here also, a trailing slash in HTML does not a self closing tag make. Self closing tags using a trailing slash are a feature of XHTML, not HTML.


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