.
          new Animation(container.getElementsByClassName("b")[0],
              [{left: "100px"}, {left: "180px"}],
              {duration: 1 * 1000, iterations: 3.0, fill: 'forwards'}),
          // Test zero iterations.
          new Animation(container.getElementsByClassName("c")[0],
              [{left: "180px"}, {left: "300px"}],
              {duration: 1 * 1000, iterations: 0.0, fill: 'forwards'}),
          ], {iterations: 2, direction: dir, duration: 4 * 1000, fill: 'forwards'}));
}
</script>
