snap(date: Date, scale: string, step: number) : Date or number</pre>
        The parameter <code>scale</code> can be can be 'millisecond', 'second', 'minute', 'hour', 'weekday, 'week', 'day, 'month, or 'year'. The parameter <code>step</code> is a number like 1, 2, 4, 5.
      </td>
    </tr>

    <tr>
      <td>start</td>
      <td>Date or Number or String or Moment</td>
      <td>none</td>
      <td>The initial start date for the axis of the timeline.
        If not provided, the earliest date present in t