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Website testing: QA checklist and common mistakes 2026

December 31, 20256 min read
Author: 7kar7son7Developer

Complete testing checklist before deployment: responsiveness, browsers, performance, SEO and accessibility.

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TL;DR

  • website testing qa checklist 2026
  • For website owners and developers who want to ensure the site works correctly.

Who this is for

  • For website owners and developers who want to ensure the site works correctly.

Keyword (SEO)

  • website testing qa checklist 2026

Responsiveness tests

  • Mobile (320px, 375px, 414px)
  • Tablet (768px, 1024px)
  • Desktop (1280px, 1920px)
  • Check all breakpoints

Browser tests

  • Chrome, Firefox, Safari, Edge
  • Mobile Safari (iOS)
  • Mobile Chrome (Android)
  • Check older versions (2 years back)

Performance tests

  • Lighthouse score > 90
  • Core Web Vitals in green
  • Images optimized
  • CSS/JS minified

SEO and accessibility tests

  • Meta tags (title, description)
  • Alt texts for images
  • Semantic HTML
  • ARIA labels for screen readers

FAQ

How long does website testing take?

Basic tests: 4-8 hours. Full QA tests: 1-2 days. Depends on site complexity.

Do I need to test on all browsers?

No, but at least Chrome, Firefox and Safari. Mobile Safari is crucial for iOS.

Want this implemented for your business?

About the author

Developer at DevStudio.it. Focused on performance, SEO and production-ready web apps.

Recommended links

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