ar target = document.getElementById("columnGapInherit");
        assert_equals(getComputedStyle(target).columnGap, "normal");
      }, "Initial inherited column-gap is 'normal'");
    test(
      function(){
        var target = document.getElementById("columnGapInheritPx");
        assert_equals(getComputedStyle(target).columnGap, "12px");
      }, "column-gap is inheritable");


    test(
      function(){
        var target = document.getElementById("invalidColumnGapNegative");
        assert_equals(getC