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Per-chart export: copy/download spec and PNG/SVG from the preview header

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Oleh Omelchenko
2026-06-10 18:30:31 +03:00
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docs/spec/04-live-preview.md
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@@ -36,6 +36,10 @@ Behavior of the selected mode:
- The selected mode persists across sessions, stored in _Settings_ as `previewFitMode`.
- The default is the natural Original mode.
## Export control
The preview pane header also carries a per-chart **Export** control — a disclosure for copying or downloading the current chart's spec, or downloading its rendered image (PNG/SVG). It exports what the preview shows. The behavior is specified in _Import & Export → Per-chart export_; it lives in this header because the image formats are produced from the live rendered view.
## Rendering Contract
Before the chart is drawn, the spec shown in the editor is transformed into the spec actually rendered. Two deterministic transforms are applied in order. They are specified here because reproducing them faithfully is what makes references and fit modes behave correctly; the result is observable as the rendered chart.