<td><code>function(event, x, points)</code></td>
<td><code>null</td>
<td>When set, this callback gets called every time a new point is highlighted. The parameters are the JavaScript mousemove event, the x-coordinate of the highlighted points and an array of highlighted points: <code>[ {name: 'series', yval: y-value}, … ]</code>
<td><code>function(event, x, points)</code></td>
<td><code>null</td>
<td>When set, this callback gets called every time a new point is highlighted. The parameters are the JavaScript mousemove event, the x-coordinate of the highlighted points and an array of highlighted points: <code>[ {name: 'series', yval: y-value}, … ]</code>