# baseline

Reference value for cartesian charts. Column / bar / area use it as the visual anchor; line uses it as a value-axis reference marker. Always explicit (default `0`) so the baseline stays visible regardless of `type`.

Canonical: https://chart.syidax.com/docs/options/baseline/

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `baseline` |
| HTML attribute | `baseline` |
| Type | `number` |
| Default | `0` |

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## Configuration example

```javascript
chart.baseline = 0;
```

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## Related documentation

A property with the same name may have different types and defaults across charts. When using a direct tag, follow that chart's documentation below.

- [Shared facade and direct tags](https://chart.syidax.com/docs/concepts.md)
- [sy-line-chart](https://chart.syidax.com/docs/components/line.md#property-baseline)
- [sy-area-chart](https://chart.syidax.com/docs/components/area.md#property-baseline)
- [sy-column-chart](https://chart.syidax.com/docs/components/column.md#property-baseline)
- [sy-bar-chart](https://chart.syidax.com/docs/components/bar.md#property-baseline)
- [sy-lollipop-chart](https://chart.syidax.com/docs/components/lollipop.md#property-baseline)
- [sy-variwide-chart](https://chart.syidax.com/docs/components/variwide.md#property-baseline)
- [sy-pareto-chart](https://chart.syidax.com/docs/components/pareto.md#property-baseline)
- [sy-gantt-chart](https://chart.syidax.com/docs/components/gantt.md#property-baseline)