Microsoft’s browser-based operating systemGet this: The entire Metro interface — the complete Windows 8 front-end — is powered by Internet Explorer 10. Not the browser with a back button and an address bar, but the IE10 rendering engine Trident. To drive this point home, Metro-style apps in Windows 8 can be written in HTML, CSS, and JavaScript, and they will be just as “low-level” as their C++ and C# cousins. In other words, Windows 8 runs web apps natively.