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Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...
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.
30 Seconds of Knowledge - Become a better developer, in every new tab.
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
User-Agent Switcher and Manager - spoofs browser's User-Agent string.
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.