Cross browser testing is a critical process ensuring web applications function uniformly across various browsers, versions, and operating systems, thereby enhancing user experience. Despite its importance, it presents numerous challenges for developers and QA teams, such as automating testing processes, maintaining in-house infrastructure, and testing across a multitude of browsers and operating systems. Solutions include employing cloud-based services like LambdaTest, which offers automated tools and extensive browser and OS support to streamline testing efforts. Key issues like frequent browser updates and visual bugs in different resolutions can be addressed through automation and comprehensive testing platforms. Additionally, common compatibility issues often arise from incorrect DOCTYPE declarations, lack of valid HTML/CSS, and outdated scripts, which can be mitigated using tools like W3C Validators and Modernizer. Although cross browser testing is complex, leveraging the right tools and strategies can significantly improve the responsiveness and accessibility of web applications, ultimately retaining clientele and expanding the customer base.