# Pattern

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Reuse this design across your site.

- **Name:** `core/block`
- **Category:** [reusable](https://developer.wordpress.org/block-editor/reference-guides/core-blocks/core-blocks-reusable/)
- **API Version:** [3](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-api-versions/)
- **Block Type:** [Dynamic](https://developer.wordpress.org/block-editor/getting-started/fundamentals/static-dynamic-rendering/) (server-rendered)
- **Keywords:** `reusable`

## Attributes

_Defined via the [`attributes`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-attributes/) property in block.json._

| Attribute | [Type](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-attributes/#type-validation) | [Default](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-attributes/#default-value) | Description |
|-----------|------|---------|-------------|
| `ref` | `number` | — | — |
| `content` | `object` | `{}` | — |

## Supports

_Defined via the [`supports`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/) property in block.json._

- [`customClassName`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#customclassname): `false`
- [`html`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#html): `false`
- [`inserter`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#inserter): `false`
- [`renaming`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#renaming): `false`
- [`interactivity`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#interactivity):
  - `clientNavigation`: `true`
- `customCSS`: `false`

## Context

_Defined via the [`usesContext` and `providesContext`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-context/) properties in block.json._

**Provides context:**

- `pattern/overrides` → attribute `content`

## Block Markup

This is a [**dynamic block**](https://developer.wordpress.org/block-editor/getting-started/fundamentals/static-dynamic-rendering/). It is rendered on the server and does not save HTML in post content.

In post content, it is stored as a block comment:

```html
<!-- wp:core/block {"ref":123} /-->
```

## Source

- [block.json](https://github.com/WordPress/gutenberg/tree/trunk/packages/block-library/src/block/block.json) ([reference](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/))
- [Source directory](https://github.com/WordPress/gutenberg/tree/trunk/packages/block-library/src/block/) — browse `edit.js`, `save.js`, `index.php`, and more.

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