Viewport Detector

the extension options with by bootstrap bootstrap. to between i i add which me class col-md- help this each it created 3 useful switch of little till version col-lg- while find the , browser will respectively is in content viewport are then as , decide while future device.
and col-sm- name different will col-xs-.
viewports and new with more represented i a you working show know to hope in the which it should resizing you