# streamTimestamps

the line family's ring stamps its points (`on`, the default — an absolute `stream-window-ms` needs them) unless `off` opts out (8 MB less at a 1M capacity for charts that only use a count window).

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

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `streamTimestamps` |
| HTML attribute | `stream-timestamps` |
| Type | `'on' \| 'off'` |
| Default | `undefined` |
| Allowed values | `off`, `on` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

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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-streamTimestamps)