See http://software.rubikscube.info/AnimCube/.
<twisty-anim-cube>
      <param name="move" value="R2 B2' R F R' B2' R F' R">
      <param name="initrevmove" value="#">
      <param name="hint" value="0">
      <param name="speed" value="5">
    </twisty-anim-cube>
<applet code="AnimCube.class" width="300" height="100">
      <param name="buttonbar" value="0">
      <param name="move" value="L' U R' F' U L2 U2 L' U' L U2 D R' D' F2 R2 U' y'">
    </applet>