Add borders to all your elements when testing out layout element sizing.

Borderizer

function borderizer(){
      var all = document.querySelectorAll("*");
      var rgb = [0, 0, 0];
      for (var i=0, max=all.length; i < max; i++) {
          all[i].style.border = "solid";
          all[i].style.borderWidth = "1px";
      }
  }