# `StageSettings.background`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `configurator-runtime.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`StageSettings`](StageSettings.md) · stable · since 2.0.0 · called as `session.document.stage.background`

```ts
background?: BackgroundSpec;
```

What is drawn behind the scene: a colour, a gradient, 'transparent' (the page shows through), 'environment' or an image backdrop ([`BackgroundSpec`](BackgroundSpec.md)).

**Default:** the document's

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `background` names no product |
| 2. A precedent | pass: [Babylon.js PhotoDome](https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Helpers/photoDome.ts) (row `K22`); [CSS linear-gradient()](https://developer.mozilla.org/en-US/docs/Web/CSS/gradient/linear-gradient) (row `K23`); [Unity RenderSettings.ambientIntensity](https://docs.unity3d.com/ScriptReference/RenderSettings-ambientIntensity.html) (row `K30`) |
| 3. Two apps, or labs | pass: 28 apps (ledger: app-4f16d2f6da, app-510d750508, app-b362a81c85, app-b4ae2fce25, app-ceb4eccc72, app-ddfb017681; fleet cross-check: app-04c2774145, app-0c773a4ee3, app-37356bf09f, app-378d190f1b, app-4762caacdc, app-4f16d2f6da, app-4fd23bc869, app-510d750508 and 20 more) |
| 4. The cheaper fix first | decided per need in Appendix B: rows `K22`, `K23`, `K30` at tier app, stable (a member only where no rule, data, asset or app code serves the need) |