acked on top of each other such that they do not overlap.</td>
    </tr>

    <tr>
      <td>snap</td>
      <td>function or null</td>
      <td>function</td>
      <td>When moving items on the Timeline, they will be snapped to nice dates like full hours or days, depending on the current scale. The <code>snap</code> function can be replaced with a custom function, or can be set to <code>null</code> to disable snapping. The signature of the snap function is:
        <pre class="prettyprint lang-js">function 