The hover configuration is passed into the `options.hover` namespace. The global hover configuration is at `Chart.defaults.global.hover`. To configure which events trigger chart interactions, see [events](./events.md#events).
| `axis` | `String` | `'x'` | Can be set to `'x'`, `'y'`, or `'xy'` to define which directions are used in calculating distances. Defaults to `'x'` for `index` mode and `'xy'` in `dataset` and `nearest` modes.