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Testing

Checklists
Some of the Basic Websites & Technical SEO Checklists
Some of the Basic Websites & Technical SEO Checklists
Some of the basic websites and technical SEO checklists that the author follows.
Design QA
Axe โ€” Web Accessibility Testing
Axe โ€” Web Accessibility Testing
Accessibility Checker for Developers in Chrome
Browsershots
Browsershots
Check browser compatibility, cross platform browser test
http://browsershots.org/
CSS Peeper
CSS Peeper
CSS Peeper is a CSS viewer tailored for Designers. Get access to the useful styles with our Chrome extension. Our mission is to let Designers focus on design, and spend as little time as possible digging in a code.
CSS Scan Pro
CSS Scan Pro
CSS Scan Pro makes it radically easy to get the looks of your favorite websites. Hover over any element, and get its CSS, font, dimensions, animations, and selector, instantly.
IDI Web Accessibility Checker
IDI Web Accessibility Checker
This tool checks single HTML pages for conformance with accessibility standards to ensure the content can be accessed by everyone.
https://achecker.ca/checker/index.php
Pixelay
Pixelay
Sick of your art director pointing out all the differences between the design and build? This Figma plugin is for you.
VisBug
VisBug
Open source web design debug tools built with JavaScript: a FireBug for designers.
Speed & Performance
Lighthouse
Lighthouse
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.
Link Checker
Link Checker
Check links and anchors in Web pages or full Web sites.
https://validator.w3.org/checklink
PageSpeed Insights
PageSpeed Insights
Have specific, answerable questions about using PageSpeed Insights? Ask your question on Stack Overflow. For general feedback and discussion, start a thread in our mailing list.
https://developers.google.com/speed/pagespeed/insights/
Pingdom Website Speed Test
Pingdom Website Speed Test
Enter a URL to test the page load time, analyze it, and find bottlenecks.