Marcus Chen

Senior QA Engineer

Building reliable testing workflows at ScanU.eu.

5 articles

Visual QA Checklist: What to Verify Before Every Release

A practical visual QA checklist for web teams. Covers layout, typography, responsiveness, cross-browser rendering, interactive states, and accessibility checks to run before every release.

Marcus ChenMar 2, 2026 · 8 min read

Read article

Multiple browser windows showing the same web page with subtle rendering differences

cross browser visual testing

responsive design

cross device testing

Cross-Browser Testing for Modern Web Apps: A Practical Workflow

How to build a practical cross-browser testing workflow for modern web apps. Covers device and browser matrices, responsive breakpoints, traffic-based prioritization, and CI strategy.

Marcus ChenFeb 27, 2026 · 6 min read

Magnifying glass over a pixel grid showing individual colored pixels

algorithms

computer vision

deep dive

Inside Pixel-Perfect Comparison Algorithms

A deep dive into the image diffing algorithms that power visual regression testing, from naive pixel comparison to perceptual hashing and structural similarity.

Marcus ChenJan 8, 2026 · 4 min read

Three device silhouettes showing responsive layouts

responsive design

automation

testing strategy

Responsive Testing Across Every Device Without Losing Your Mind

Testing responsive layouts manually is a losing battle. Here is how to automate visual testing across every viewport that matters to your users.

Marcus ChenNov 28, 2025 · 4 min read

Overlapping browser window icons in a layered composition

cross-browser

CSS

visual testing

Achieving Cross-Browser Visual Consistency in 2026

Chrome, Firefox, Safari, and Edge all render your CSS slightly differently. Learn the techniques for achieving pixel-level consistency across every browser your users run.

Marcus ChenOct 15, 2025 · 4 min read