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| Name                | Type    | Required    | Description                                                                                                |
| ------------------- | ------- | ----------- | ---------------------------------------------------------------------------------------------------------- |
| headingLevel        | number  | no          | Heading level for each item heading. Defaults to `3` (`<h3>`). Must be between 2 and 6.                    |
| items               | array   | yes         | Array of timeline item objects. Falsy entries are ignored.                                                 |
| items[].headingText | string  | yes         | Text for the item heading.                                                                                 |
| items[].html        | string  | conditional | If `text` is set, this is not required. Raw HTML description inserted directly. If set, `text` is ignored. |
| items[].text        | string  | conditional | If `html` is set, this is not required. Plain text description wrapped in a paragraph element.             |
| items[].active      | boolean | no          | Renders a large blue dot and bold heading styling for the current (active) item.                           |
| items[].isPastItem  | boolean | no          | Marks the item as past: large blue dot and adds modifier class `nhsapp-timeline__item--past`.              |
| id                  | string  | no          | The ID of the timeline.                                                                                    |
| classes             | string  | no          | Classes to add to the timeline.                                                                            |
| attributes          | object  | no          | HTML attributes for the timeline (e.g. `data-*`, `aria-*`).                                                |