    var target = document.getElementById("gapPxPercent");
        assert_equals(getComputedStyle(target).rowGap, "12px");
        assert_equals(getComputedStyle(target).columnGap, "10%");
      }, "gap accepts pixels combined with percentage");
    test(
      function(){
        var target = document.getElementById("gapEm");
        assert_equals(getComputedStyle(target).rowGap, "20px");
        assert_equals(getComputedStyle(target).columnGap, "20px");
      }, "gap accepts em");
    test(
      function(