If you are having trouble with something while building a webpage, the most helpful thing you can possibly do is start building a reduced test case. "Trouble" could be anything: the CSS isn't doing what you think it should, the JavaScript isn't behaving right, there are cross-browser issues, etc. In the process of creating a reduced test case, you will either:
- Find out it was a mistake you made, help you isolate it, and fix it (or have a great test page for asking for help)
