Hey everyone!
Check out this video by Anton on mastering Responsive Design Testing. 
Learn the techniques to elevate your test automation skills and stay ahead in the game!
Watch now and take your skills to the next level! 
In my experience, viewport simulation has been a key part of responsive design testing in automation frameworks. Using tools like Selenium or Cypress, I’ve been able to easily adjust browser window sizes or apply predefined breakpoints to simulate different devices—whether it’s desktop, tablet, or mobile. This approach has helped me catch layout issues early on, ensuring the application looks and functions perfectly across all screen sizes. It’s a simple yet powerful way to ensure a seamless user experience on any device!
Adding to Yanisleidi,
Another approach involves executing tests on real devices or cloud-based device farms. Platforms like LambdaTest or BrowserStack provide access to a wide range of real mobile devices and browsers.
By running tests directly on these devices, the automation framework can ensure that the web application adapts responsively in actual usage scenarios, verifying that design elements, performance, and layout behave as expected across various devices.
Automated CSS and Layout Validation: Automation frameworks can also incorporate tools for automated CSS validation and layout comparison. Tools like Galen Framework or Applitools allow testers to define rules for responsive design, such as checking if elements are positioned correctly or if certain UI components are visible on smaller screens.
These tools help validate responsive behavior automatically by comparing screenshots and verifying that design changes don’t break layout consistency.