, "invert-box", "webkitFilter", 'invert(0.25)', 0.05],
      [0.5, "opacity-box", "webkitFilter", 'opacity(0.75)', 0.05],
      [0.5, "brightness-box", "webkitFilter", 'brightness(0.75)', 0.05],
      [0.5, "contrast-box", "webkitFilter", 'contrast(0.75)', 0.05],
      [0.5, "blur-box", "webkitFilter", 'blur(5px)', 1],
      // FIXME when we implement computed filter style for drop-shadow.
      // ["dropshadow-anim",  1, "dropshadow-box", "webkitFilter", 'drop-shadow(rgba(0, 0, 0, 0.25) 5px 8px 3px )', 2],