More than two decades ago, browsers had limited functionality and could only run simple online games. As technology advanced, browsers have become increasingly powerful, expanding their capabilities from playing videos and music to editing documents, video editing, drafting design work, and even cloud streaming of 3A games. Now, a developer named copy has taken this trend to new heights through the v86 project, embedding over 100 operating systems in browsers, ranging from Windows 1.01 to Windows 2000, Linux, FreeBSD, Android, and several niche systems. These systems are not simulated reproductions but run the original versions directly in the browser, allowing users to freely switch themes, browse the internet, and even experience classic games. The v86 project simulates hardware behavior through code, precise to every register and timing, and employs JIT compilation technology to convert x86 machine code into WebAssembly for smooth operation. Copy (real name Fabian Hemmer) also founded Droplet Computing to commercialize this technology, enabling desktop applications to run directly in browsers.