Progressive Web Apps (PWAs), a concept introduced by Google in 2015, represent a shift in how web applications are developed and tested, providing a mobile app-like experience through modern browser capabilities. PWAs are characterized by their reliability, speed, and engaging user experiences, allowing them to function offline and deliver fast loading times, which are crucial for retaining users. Their adoption has grown significantly, driven by business performance improvements and increased implementation by web strategists and large organizations. Testing PWAs requires both manual and automated approaches, utilizing tools like Lighthouse and LambdaTest to ensure functionality across various devices and browsers, while also maintaining SEO standards through techniques like canonical URLs. The importance of cross-browser testing is emphasized due to the dependence of PWAs on modern browser features, which can vary widely across different platforms. As PWAs continue to enhance user engagement and brand trust, effective testing becomes essential to fully leverage their potential in an evolving digital landscape.