To go along with Detooth's comments about how important clean code is, an easy way to "validate" one's code is to use the web browser Firefox with the Webdeveloper extension. This extension adds many great web developer tools to the right mouse click contextual menu including HTML and CSS validation. This can greatly speed the process of finding and correct HTML and/or CSS coding errors that the browser might be ignoring when rendering pages.
An added side benefit with designing webpages that validate to W3C.org's specifications is that valid pages tend to render more consitantly across a wide range of web browsers than does dirty code with lots of HTML validation errors.
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