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Validation Services
JSON Validator: http://jsonlint.com
HTML : 5 http://validator.w3.org
CSS : http://jigsaw.w3.org/css-validator
Accessibility : http://wave.webaim.org
RSS/Atom feeds : http://validator.w3.org/feed
MobileOK content : http://validator.w3.org/mobile
http://www.webpagetest.org - speed testing too
#html - #css - #accessibility - #testing
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