Playwright

A browser automation framework for end-to-end testing across Chromium, Firefox, and WebKit.

Playwright drives a real browser to click, type, and assert against a site the way a person would, rather than testing in isolation — the closest a test suite gets to “did this actually work” without a human in the loop.

This site’s own e2e suite is built on it: a Playwright container runs against a production build of the site itself, covering navigation, the responsive layout, and every interaction on this glossary popup system.