I have a specification document which states - Bootstrap Col Spans -2 (.col-span-2). So does that mean I should use col-xs-2 and col-lg-2 while writing the html class names? Or does that mean I should use col-lg-6?
Also, can I use multiple containers in a single bootstrap html page?
span-2 would be col-md-2. By my experience Span was supported in Bootstrap V2. http://getbootstrap.com/css/#grid look at the Grid Options of the documentation.
Also how come you would like multiple containers? would it not be feasible to use divs?
(Added answer due to unable to comment) Trying to help instead of providing the perfect answer.
Hope this helps.