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W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Checklist Design - The best UI and UX practices for production ready design.
Total Validator - Total Validator can check your website to help ensure that it is accessible, uses valid HTML and CSS, has no broken links, and is free from spelling mistakes.
Business-Driven Digital Product Design - A guide on how to create influential user experience
Rocket Validator - Site-wide Accessibility and HTML validation made easy. With a single click, Rocket Validator will check thousands of web pages on your site for Accessibility and HTML conformance, producing a detailed, actionable report on seconds.
UX Design Weekly - The best user experience links each week to your inbox