XHTML: Close Empty Tags

All empty tags must be closed. Include a space before the trailing "/>" of empty tags to ensure backward compatibility with the browsers.

These elements are all done the wrong way:
A break:   ==>  <br>
A horizontal rule:   ==>  <hr>
An image:   ==>  <img src="happy.gif" alt="Happy face">
These elements are done the correct way:
A break:   ==>  <br />
A horizontal rule:   ==>  <hr />
An image:   ==>  <img src="happy.gif" alt="Happy face" />
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