Bugs

Consider various strategies for debugging your pages.

Use a validation service to make sure your code is compatible with all browsers.

Here are two overviews and comparison of services:
http://www.webcom.com/html/validators.shtml
http://www.builder.com/Authoring/HtmlValid/ss01.html

The W3C HTML Validation Service is the most famous code checker.
It displays your code with the line numbers, which is a big help.
It provides very precise and stringent critiques, with a detailed
explanation of how your code may conflict with HTML standards.

Here is another very popular site:

http://www.websitegarage.com/
Web Garage offers a stereotypical mechanic to check a page of your site.
Info is also provided on dead links, download time, and publicity factors.

Submit a page to a validation service. (Put the URL in your page.)
Describe the results of the validation.
What would you fix and what would you leave alone?
Consider various other strategies for debugging your pages.