The article provides an in-depth analysis of calculating the return on investment (ROI) for test automation using Selenium, particularly in the context of cross-browser testing. It highlights the challenges organizations face when transitioning from manual to automated testing, emphasizing the need to present a compelling case to management by focusing on the time and cost savings, increased efficiency, and improved test coverage that automation can offer. The text discusses various metrics and techniques for evaluating test automation ROI, such as defect detection, test coverage, and time savings, while also considering the trade-offs, including the cost of resources and tools. Furthermore, it addresses common mistakes in ROI calculation, such as neglecting manual testing and failing to maintain proper documentation. The article also suggests best practices, like prioritizing the automation of new test cases and utilizing cloud-based tools for parallel testing, to maximize the benefits of test automation with Selenium.