codecademy HTML course
w3schools HTML reference
htmldog HTML Reference
W3C HTML 5 reference
Local HTML validator or
official HTML validator and nu validator, but note that the external validators will not be able to view your pages by URL. You will need to use "file upload" or "direct input". Using the local server is recommended for the pages created for this course.
CSS Validator
GET vs POST explained
How to center things in CSS
CSS Properties List from w3schools
CSS reference: from W3C
(fairly detailed), or a simpler guide to CSS3 properties
Web safe colors
Cookie example with better parsing
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