The necessity of testing websites on older browser versions is highlighted due to persistent usage by some users and corporate restrictions that prevent frequent updates. Despite the regular release of new browser versions, testing on outdated versions is essential to maintain user experience, retain traffic, and prevent revenue loss. Various methods are suggested for cross-browser testing, including using browser emulators, installing older versions directly, utilizing local or cloud-based virtual machines, and employing developer tools. Among these, cloud-based testing platforms like LambdaTest are particularly recommended for their efficiency and cost-effectiveness, offering a wide range of browser and device combinations along with automation and debugging features. Ensuring compatibility across all browser versions, even the outdated ones, is crucial for a seamless user experience and a positive brand reputation.