---
title: "primary · RUAL Documentation"
description: "background in primary style"
canonical: https://docs.rual.nl/block-types/ui class/uiclass_background_primary
language: en
---

# primary

This block is part of the [`ui class`](https://docs.rual.nl/block-types/ui%20class) group and was last modified in core [`v10.4.28`](https://docs.rual.nl/core-versions/100428).

background in primary style

- uiclass `uiclass`

A typical wiring for [primary](https://docs.rual.nl/block-types/ui%20class/uiclass_background_primary): the `uiclass` out pin feeds [regular card](https://docs.rual.nl/block-types/state%20ui/state_card).

![Studio canvas example for the primary block: typical wiring for primary.](https://docs.rual.nl/canvas-examples/uiclass_background_primary.png)

### Version history

Introduced in [`v10.4.28`](https://docs.rual.nl/core-versions/100428).