Well the thing is, none of your reasons are applicable here. He has a valid question as to why you would need JS as this is purely a styling between mobile and desktop. The only thing you could potentially do with JS would be to strip the content and rerender it which would be very strongly tied to the HTML structure. Once again, your points are valid, mostly, but for this particular problem, you wouldn't need or even want to do it via JS. I think that's the solution to the original question.