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Automated visual regression testing for web applications
BackstopJS captures screenshots, compares them against baselines, and generates visual diff reports, supporting Chrome Headless, Playwright, Puppeteer, Docker, and CI pipelines with a simple three‑command workflow.

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Detect CSS regressions after theme update
Automated screenshots reveal layout shifts, enabling quick approval or rollback.
Validate responsive design across devices
Tests run across defined viewports, ensuring consistent appearance on mobile, tablet, and desktop.
Capture UI changes from feature flag toggles
Interaction scripts simulate user actions, confirming visual state matches expectations.
Integrate visual checks into CI pipeline
JUnit reports feed into CI dashboards, failing builds when visual diffs exceed thresholds.
Run `npm install -g backstopjs` for a global install or `npm install backstopjs` locally and require it in your Node code.
Yes, add the `--docker` flag to `backstop test` to execute rendering inside a Docker container for consistent results.
Chrome Headless is the default; Playwright and Puppeteer allow testing with additional browsers and interaction capabilities.
The in‑browser UI shows reference, test, and diff images with a scrubber; the CLI also outputs a summary and JUnit report.
Run `backstop approve` (optionally with `--filter`) to promote test images to the reference baseline.
Project at a glance
DormantLast synced 4 days ago