This document discusses how to test websites on Internet Explorer and Microsoft Edge across different platforms like Mac and Linux. It provides various resources like the Microsoft Edge Developer Portal, status dashboards, developer guides and tools to help test compatibility and debug issues. Specific testing options are outlined for desktop browsers like IE11 and Edge, as well as mobile browsers using tools like Weinre, Vorlon.js and Adobe Edge Inspect. The document emphasizes that Microsoft is continuously improving testing and debugging tools to help developers support older browsers and move users to more modern options.