Cypress

Cypress is a JavaScript end-to-end testing framework built specifically for testing modern web applications inside a real browser, distinguishing itself from Selenium-based tools by running directly inside the browser's execution context rather than communicating over a remote protocol. This architecture gives Cypress fast, deterministic test execution with automatic waiting (no manual `sleep()` calls needed for elements to appear), time-travel debugging that lets a developer step back through each command in a failed test, and screenshots/video recordings captured automatically on failure.