Cross-browser testing is essential to delivering a flawless user experience to customers, as it ensures compatibility with different browsers, operating systems, devices, and resolutions. Manual cross-browser testing involves performing tests step by step without automated test scripts, allowing human testers to check on application elements that may not be highlighted by automation. While automated testing can shorten release cycles, manual testing is still necessary in various scenarios such as usability testing, security components, and complex functionalities. To get started with manual testing, it's crucial to select the right browsers to test on, considering factors like internal and external sources, browser popularity data, and device coverage. A strategic approach to selecting browsers can optimize testing strategy and maximize market coverage. Conducting manual cross-browser testing involves creating a testing strategy, setting up infrastructure, and executing tests to refine efforts and ensure product quality. By implementing a solid manual testing strategy, developers can reap the benefits of testing and gain a competitive advantage in delivering a seamless user experience.