<div>s are semantically neutral so while it is extra markup, it's not like they had any semantic meaning in the first place. The relevancy of semantics is a can

<div>s are semantically neutral so while it is extra markup, it's not like they had any semantic meaning in the first place. The relevancy of semantics is a can of worms in of itself... If you're not interested in separating layout markup from content markup, the box-sizing property might be for you. But I'd certainly avoid using calc()...