Microsoft shows off Spartan browser for Windows 10 phones
As you'd expect after seeing yesterday's preview, the new browser has a clean, flat user interface, seemingly supporting both dark and light themes (which we'll probably be able to switch with ease). Spartan is developed as a single browser for all Windows 10 devices, from PCs (with or without touch-enabled screens) to tablets and, of course, smartphones. That's why the Spartan features showcased yesterday - including Cortana integration, the ability to take notes on your screen, and a new reading mode - will be available on Windows 10-based phones.
Even if you're going to test Windows 10 before its official release (as part of Microsoft's insider program), you won't be able to use Spartan yet, as this is likely not going to be launched before summer. But at least it's coming this year.
source: Microsoft via Windows Central