How to Avoid CORS Errors with Puppeteer in Firebase Callable Functions
Fix Firebase Puppeteer CORS errors by matching the trigger, client protocol, origin, and preflight behavior with working onCall and onRequest examples.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
Why backdrop-filter Blur Looks Different in Headless Puppeteer Screenshots
Headless Puppeteer screenshots can render backdrop-filter blur differently across environments. Learn what to compare and how to make captures reproducible.
Visual Regression Testing with Loki
Set up Loki with Storybook, create reviewable baselines, run visual tests in CI, fix failures, and compare Loki with ScreenshotNeo.
Headless Chrome and Puppeteer: Window Size vs. setViewport
Learn exactly how Puppeteer’s setViewport, --window-size, and page.resize differ, and choose the right setting for reliable screenshots and tests.
How to Fix Blank Pages in Puppeteer Without Breakpoints
Diagnose blank Puppeteer screenshots with logs, network evidence, render checks, headful runs, and DevTools protocol tracing—without breakpoints.
How to Fix Puppeteer Full-Page Screenshots in Headful Mode
Fix headful Puppeteer full-page screenshot flicker, viewport changes, and layout shifts with the right options and diagnostics.
Why Puppeteer Serves Different Pages in Headless and Headful Modes
Modern Puppeteer headless Chrome shares its browser implementation with headful Chrome, but versions, launch modes, screen settings, sessions and page timing can still differ.
How to Get Chrome DevTools Network Timing Data With Puppeteer
Capture DNS, TLS, TTFB, download, and total request timings in Puppeteer with CDP, requestId correlation, and robust failure handling.
How AI-Powered Visual Regression Testing Works for Websites
Learn how visual regression tests compare browser screenshots with approved baselines, where AI can help, and how to keep results reliable in CI.
What Does Non-Regression Testing Mean?
Non-regression testing checks that a change has not broken behavior that should remain unchanged. Learn how it differs from retesting and how to choose useful checks.
Pantheon Visual Regression Testing: Autopilot, BackstopJS, and CI
Pantheon Autopilot checks WordPress and Drupal updates with before-and-after screenshots in Multidev. Here’s how it works, how to review results, and how to build a BackstopJS workflow.
Regression Testing Test Cases
Learn how to select, prioritize, write, automate, and troubleshoot regression testing test cases after software changes.
iOS Visual Regression Testing: A Complete XCTest and CI Guide
Build reliable iOS visual regression tests with XCTest, deterministic baselines, pixel diffs, CI checks, and practical fixes for flaky screenshots.
Unit and Regression Testing: A Practical Guide for Reliable Software
Learn how unit and regression tests differ, how to build a maintainable suite, choose coverage targets, reduce flakiness, and place tests in CI.
Automated Visual Regression Testing With Playwright
Learn how to build reliable Playwright visual regression tests, control rendering noise, review diffs, and keep CI baselines trustworthy.
Latest Version of Puppeteer (v25.12.0): What Changed and How to Update
Puppeteer v25.12.0 is the latest release. Learn what changed, how to update safely, choose puppeteer vs puppeteer-core, and fix Chrome install errors.
How to Convert HTML to Images with an Open-Source GitHub API
Build a GitHub-friendly HTML-to-image API with Playwright or Puppeteer, return PNG bytes, and understand full-page, element, and production options.
What Is Visual Regression Testing? A Practical Guide
Learn how visual regression testing uses screenshot baselines to catch UI changes, stabilize Playwright tests, and choose a review workflow.