Useful Web Design Checklist
Designing
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Quality of code
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Does the site use a correct Doctype?
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Does the Site use a Character set?
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Does the site use Valid (X)HTML?
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Does the site use Valid CSS?
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Does the site use any CSS hacks?
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Does the site use unnecessary classes or ids?
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Is the code well structured?
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Does the site have any broken links?
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How does the site perform in terms of speed/page size?
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Does the site have JavaScript errors?
Learn more:
https://www.smashingmagazine.com/2009/06/45-incredibly-useful-web-design-checklists-and-questionnaires/