d class="midMethods">Returns: none</td>
                <td>Set an event listener only once. After it has taken place, the event listener will be removed. Depending on the type of event you get different parameters for the callback function. Look at the event section of the documentation for more information.
                </td>
            </tr>


            <tr id="methodCanvas" class="subHeader">
                <td colspan="2">Methods related to the canvas.</td>
            </tr>
            <tr clas