Validate

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Validation is an important tool to help you help yourself find problems. Remember, however, being 100% valid isn't the most important issue when it comes to HTML and CSS if you know what your errors are, why they are there and they won't cause any problems.

Note on automatic validation

Note that the CSS validator will fail on browsers extensions even if they're valid according to the specs. Browsers property extensions will have a -<browser identifier>- prefix, eg. gecko use -moz-, Opera use -o- and so on. IE does not use the -<browser identifier>- prefix naming convention on their pre IE7 property extensions. Since IE7 they use -ms-. In addition to this bug, you may find many other bugs in the validator, so even though validation saves you from a lot of problems, you should always look through your code to assure it's 100% valid.

Further Reading

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