Spartan, the upcoming web browser from Microsoft has yet to arrive on any Windows 10 preview builds including Desktop and Mobile. But, official and unofficial screenshots (leaks) have kept us informed. Latest in the series of leaks are many screenshots of Spartan on Windows Mobile 10, posted by site WindowsMania.pl.
It is not clear which build these screenshots belong to but you can have a look at how the browse looks in portrait and landscape modes, settings and reading list. The address bar is still on the top in the screenshots. Source
Thanks Footie for the tip. Cheers!!