gap accepts calc() mixing fixed and percentage values");
    test(
      function(){
        var target = document.getElementById("columnGapInitial");
        assert_equals(getComputedStyle(target).columnGap, "normal");
      }, "Initial column-gap is 'normal'");
    test(
      function(){
        var target = document.getElementById("columnGapInitialPx");
        assert_equals(getComputedStyle(target).columnGap, "normal");
      }, "Initial column-gap is 'normal' 2");
    test(
      function(){
        v