The **Custom Events** plugin adds native‑like DOM event handling (click, dblclick, right‑click, hover, etc.) to Highcharts elements such as axis labels, titles, series, legends, crosshairs and more, letting developers create richer interactive charts without work‑arounds. It’s packaged as a separate add‑on maintained by Black Label for Highcharts users who need fine‑grained interactivity in dashboards and data‑visualization applications.