Question 1

How to set up CSS Critic for visual regression testing?

Accepted Answer

Install via npm, create a RegressionRunner.html file similar to the example, serve it on a local webserver with something like `python3 -m http.server`, and register test cases using `csscritic.add()` with URLs and descriptions. Save reference images and re-run to compare layouts.

Question 2

CSS Critic or BackstopJS for visual regression testing?

Accepted Answer

CSS Critic is lighter and more collaborative with web-based sharing, ideal for quick feedback and designer-developer teams. BackstopJS offers more automation and configuration for CI/CD pipelines, but with steeper setup. Choose based on need for simplicity versus integration.

Question 3

Can CSS Critic test responsive designs across screen sizes?

Accepted Answer

Yes, you can test responsive layouts by specifying different viewport sizes in test cases, as it compares images of rendered pages. However, setup requires manual configuration for each screen size, and dynamic adjustments might be limited.

Question 4

What to do when a CSS Critic test fails?

Accepted Answer

Inspect the provided diff image to see visual changes. If unwanted, fix the CSS or HTML; if deliberate, accept the change to generate a new reference image. This manual review process is built into the tool for flexibility.

Question 5

Does CSS Critic support headless browser testing?

Accepted Answer

Not directly; it runs in a browser environment, requiring a server and manual interaction. For headless automation, you'd need to wrap it with tools like Puppeteer, but this adds complexity compared to dedicated headless testing frameworks.

Question 6

How to integrate CSS Critic with continuous integration pipelines?

Accepted Answer

Integration is possible but manual; you might need to script browser automation (e.g., using Selenium) to run tests and capture images. It's not designed out-of-the-box for CI/CD, unlike tools like Jest with snapshot testing.

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