I was working on an web application today that was having trouble rendering correct. The client added a link to the page and color of the text after that link would render incorrectly. If they took the <a href></a> anchor tag out of the HTML it would render fine. So I looked at the HTML for them and found that they had the anchor tags inside of a list and that one of the lists had not been closed properly. I thought that might be it, but No luck. I then noticed that they were using the anchor tag like a div tag.
<a class="content">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Integer nonummy tincidunt turpis. Cras venenatis. Vestibulum vehicula. Pellentesque quam enim, porttitor at, ultrices et, semper eget, odio. Integer quis libero. <a href="link.htm">Link Text</a>Aliquam erat justo, lobortis at, laoreet vel, commodo ac, nisl. Etiam ullamcorper viverra velit. Etiam non nibh. Etiam ut urna nec neque mollis adipiscing. Vestibulum id libero. Curabitur ornare nulla eget felis.
</a>
The problem, as you may or may not know, is that you cannot have nested anchor links.
Check it out: http://www.w3.org/TR/html4/struct/links.html#h-12.2.2
The simple fix here is to change the outside anchor tags that are used like containers to div tags.
Here are both examples on one page
http://devcow.com/blogs/adnrg/samples/nestedanchor.htm