I don't understand how you are mixing content with presentation by using a grid any more than any other method of design? With bootstrap you mostly use CSS cla

I don't understand how you are mixing content with presentation by using a grid any more than any other method of design? With bootstrap you mostly use CSS classes to dictate presentation so you can keep your HTML pretty clean. If I wanted to make a website with perfect separation of content and presentation, how would I go about it?