 }
    }

  </style>
  <script src="../../animations/resources/animation-test-helpers.js"></script>
  <script type="text/javascript">
    const expectedValues = [
      // [time, element-id, property, expected-value, tolerance]
      [0.5, "grayscale-box", "webkitFilter", 'grayscale(0.25)', 0.05],
      [0.5, "sepia-box", "webkitFilter", 'sepia(0.25)', 0.05],
      [0.5, "saturate-box", "webkitFilter", 'saturate(0.75)', 0.05],
      [0.5, "hue-rotate-box", "webkitFilter", 'hue-rotate(45deg)', 5],
      [0.5