Feature detection and graceful degradation techniques allow developers to provide fallbacks for unsupported features or older browsers, maintaining functionality without compromising the user experience. Continuous testing across multiple browsers and devices is paramount to identifying and addressing compatibility issues early in the development process. Automated testing tools like Selenium, BrowserStack, and CrossBrowserTesting facilitate cross-browser testing by simulating user interactions and capturing screenshots across different environments. Additionally, leveraging browser developer tools and online validation services can help diagnose and rectify compatibility issues efficiently. Achieving cross-browser compatibility in web development necessitates a multifaceted approach encompassing thorough testing, adherence to standards, and judicious use of technologies and techniques. By understanding the intricacies of browser rendering engines, embracing responsive design principles, and employing progressive enhancement strategies, developers can deliver robust and accessible web experiences across a diverse range of platforms and devices. Despite the inherent challenges, prioritizing cross-browser compatibility is essential to reach and engage with users effectively in today’s interconnected digital landscape.