# hitTestLeaf

Stem-leaf-only — hit-test the leaf at canvas-relative coordinates.

Canonical: https://chart.syidax.com/docs/methods/hitTestLeaf/

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## Definition

```typescript
hitTestLeaf(cssX: number, cssY: number): Promise<{ sourceIndex: number; value: number; stemLabel: string; digit: number } | null>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `cssX` | `number` | Required |
| `cssY` | `number` | Required |

Return type: `Promise<{ sourceIndex: number; value: number; stemLabel: string; digit: number } | null>`. Call the method after element registration and await its Promise result.

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## Related charts

- [sy-stem-leaf-chart](https://chart.syidax.com/docs/components/stem-leaf.md#method-hitTestLeaf)