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other issues

• Test your site on various browser types and window sizes
• Put your pages through a HTML validator like http://validator.w3.org/
• Don't underline text - users will assume it's a link
• Don't include punctuation marks (commas etc) in hyperlinks - it looks untidy
• Do use blue text for unvisited links and red/purple text for visited links - users understand these
• Don't unnecessarily send users to a new browser window (<a target=_blank" ...>) - it destroys the "back" button facility in their browser, which is the most common way users backtrack. It doesn't necessarily keep users on your site (the reason people use this HTML) and it's very annoying.