Nibbler - Test any websiteFree tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Google Structured Data Testing Tool
Send feedback Stay organized with collections Save and categorize content based on your preferences. Google recommends that you start with the Rich Results Test to see what Google rich results can be generated for your page. For generic schema validation, use the Schema Markup Validator to test all types of schema.org markup, without Google-specific validation.
Responsive Design Testing
Responsive Web Design Testing Tool This tool has been built to help with testing your responsive websites while you design and build them. You can enter your website's URL into the address bar at the top of this page (not your browser's address bar) to test a specific page. Unfortunately, with the way browser security works, you are unable to navigate your site through the frames that your website
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Coveralls.io - Test Coverage History and Statistics
