Tools and services to validate css / html / code.
Walidator.com : front end to most common official validators
Markup Validation Service : Markup Validation Service by W3.org
CSS Validator : CSS Validation Service by W3.org
CSSCheck : CSS validator at HTMLHelp
Feed Atom and RSS Feed Validator : Atom and RSS Feed Validator at FeedValidator.org
HTML Validator : online validator […]
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