CSS width percentage accuracy

Question

Would width: 33.3% or width: 33.3333333% be less wide (accurate) than width: calc(100% / 3); (would equal to 33.33∞ <- infinite). In Math it does, but CSS..?

Answer 1

In my experience, the calc is more accurate. If I have 3 columns filling the entire viewport with equal width, the calc(100vw / 3) always work in all browser, but 33.3333vw sometimes leaves a single pixel line in between.

You might find more info here: https://trac.webkit.org/wiki/LayoutUnit