The text provides a comprehensive guide for implementing cross-browser testing using Selenium WebDriver with PHP, focusing on Internet Explorer (IE) and Microsoft Edge. Despite IE's decline, it still holds a minor market share that may be significant for some demographics, while Edge, built on the Chromium project, is rapidly gaining ground. The guide details the setup for both browsers, highlighting the differences in configuration and execution on local and cloud-based Selenium Grids like LambdaTest. Emphasizing the importance of testing on various browser and OS combinations, it outlines the steps needed to create browser sessions using desired capabilities, and provides code walkthroughs for launching tests on both browsers. It further discusses the benefits of cloud-based testing, particularly for parallel test execution and scalability, thereby accelerating test automation processes. The guide also touches on the importance of maintaining compatibility with older operating systems and browsers, ensuring comprehensive test coverage.