equals(getComputedStyle(target).rowGap, "normal");
        assert_equals(getComputedStyle(target).columnGap, "normal");
      }, "gap with three values is invalid");
    test(
      function(){
        var target = document.getElementById("invalidGapSlash");
        assert_equals(getComputedStyle(target).rowGap, "normal");
        assert_equals(getComputedStyle(target).columnGap, "normal");
      }, "gap with slash is invalid");
    test(
      function(){
        var target = document.getElementById("inval