CSS VALIDATION
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C.S.S. Validation.
Validation is done by using the "EXTERNAL" button on the GUIGUTS toolbar, and calling the CSS validator, or by going directly to at http://jigsaw.w3.org/css-validator . Select the "Validate by file upload" tab. Where it says "Local CSS File", browse to your HTML file, then validate.
It's a good idea to scroll through the first few pages of the results even when it says "Congratulations! No Error Found". There may still be warnings lurking.
FYI, to use the current version of the css validator, it is not necessary to edit your HTML first.