I really love the Picture in picture and Slide over features of iOS9 on my iPad mini2.
Unfortunately full Split View is not supported for my device. I did found a few 3rd party internet browsers which have the possibility to open 2 websites at once and use/scroll on both at the same time (this is not 'real' Apple Split View' feature but still for browsing two website this works on my iPad mini2.
uSurf Universal(free) | requires iOS8 or later (and also supports Apple's Slide over/Split view)
Split Screen Browser (free) | requires iOS7 or later
Split Web Browser (free) | requires iOS6 or later
Browse and Tube /
Browse and Tube Free | requires iOS4.3 or later
To see which apps support Slide over / Split view and Picture in Picture check
this topic.