Windows is very epic, but they did break compatibility a few times: the new driver model since Windows 7 (?) for example. The Web probably has a longer history

Windows is very epic, but they did break compatibility a few times: the new driver model since Windows 7 (?) for example. The Web probably has a longer history of not breaking things, but also has a smaller feature set to keep track of than Windows. All in all, very hard to compare. But both undoubtedly epic.