this is useful if you have a nav that hits the right side of the screen and you want it to open on the left rather than the right side. you can see on the very right drop down item opens with its item..
Update: the demo on this one seems a bit broken, i have to fix it! :) you can view a working demo here: https://codepen.io/kruxor/pen/PpGLRG
This is one that i had a demo of on codepen, and then code..