Browser compatibility issues continue to be a significant challenge for web developers, particularly with the complexity of CSS and the diverse interpretations by different browsers. The State of CSS Survey 2022 highlighted that most developers encounter compatibility problems, with Internet Explorer being the most troublesome. Issues arise from differences in how browsers handle CSS features like Flexbox, Grid, position: sticky, aspect-ratio, transforms, and filters, leading to inconsistent user experiences across platforms. To address these challenges, developers must perform extensive cross-browser testing, often using tools like LambdaTest, which allows testing across numerous browser and device combinations. Ensuring compatibility requires a combination of using cross-browser-compatible CSS frameworks, adhering to best coding practices, and ongoing testing and debugging. Despite the advancements in web technologies, browser compatibility remains an ongoing concern that necessitates vigilance and adaptability from developers to ensure seamless user experiences.