To ensure your React applications deliver a consistent user experience, you need to verify their behavior across multiple browsers. Playwright makes this process straightforward by supporting automated testing in Chromium, Firefox, and WebKit. You can configure Playwright to run your test suite in all three browsers with minimal setup. In your Playwright configuration file, you define projects for each browser, specifying the use property with the desired browser type. When you execute your tests, Playwright launches each browser in turn and runs the same scenarios, helping you catch browser-specific issues before your users do. This comprehensive approach increases your confidence that your application works reliably for everyone, regardless of their chosen browser.

Modern users frequently access web applications on a variety of mobile devices. Playwright enables you to emulate mobile environments, allowing you to test how your React app responds to different screen sizes, touch input, and device characteristics. By leveraging device descriptors, you can instruct Playwright to simulate popular devices like iPhones or Android phones. This is particularly useful for verifying responsive layouts, ensuring navigation menus, buttons, and content adapt gracefully to smaller screens. Emulating mobile devices in your test suite helps you identify layout or usability issues early, so your app remains accessible and intuitive on any device.