An invalid mark-up code – To make sure that your mark-up code is valid use a validator such as the W3C Markup Validation Service. Of course when validating you should know which errors to look out for by asking the following questions:
* Does your file contain a document type declaration (DTD) statement?
* Are all of your tags closed properly?
* Are your tags written in lower case letters?
* Are all of the tag attribute values, even numerals, as in
, enclosed in quotes?
* Are the tag attributes used in your code valid?
* Are you using deprecated tags?
* Are your tags positioned in the right place in your code?
* Are your tags nested correctly?
* Are you using the escape special character & for the ampersand character in your href attribute URL values?
After validation you should still test your pages on different browsers to see how well they fare and make adjustments accordingly.
Bad links – Bad links include mistyped and expired URLs as well as structural and site design problems that compromises your site’s SEO. Link checkers are available online to help you check your links. Some of the more common link problems also include:
* File Not Found 404 errors
* Missing page elements
* Mixed canonicalized links
* Navigation blockages
Other coding errors that can kill your site include:
* Missing, empty, or duplicate title tag
* Missing, empty, or duplicate meta description tag
* Missing, empty, or duplicate h1 tag
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