I'm wondering if we are talking about the same "Snap"...
Both in Windows 8 & before it there is what is called 'Snap' or 'Rip n Snap'. This allows 2 windows to equally share the screen OR allows 'ripping' one site out of a tabbed browsing window of more than one site and 'snap' it & what's left.
This is done by Win+<-- & Win+--> and doesn't care about resolution.
The 'Snap' in Windows 8 that is supposed to require 1366x768 allows an APP to share the screen w/ the Desktop, to the left or right or share w/ another APP.
This is done from the APP (Switcher) Bar & is resolution dependent, @ least, supposedly.