# Custom HTML

<!-- START TOKEN(Autogenerated block API docs) -->
Add custom HTML code and preview it as you edit.

- **Name:** `core/html`
- **Category:** [widgets](https://developer.wordpress.org/block-editor/reference-guides/core-blocks/core-blocks-widgets/)
- **API Version:** [3](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-api-versions/)
- **Block Type:** [Static](https://developer.wordpress.org/block-editor/getting-started/fundamentals/static-dynamic-rendering/) (saved in post content)
- **Keywords:** `embed`

## 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 |
|-----------|------|---------|-------------|
| `content` | `string` | — | [Source](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-attributes/#value-source): `raw`. [Role](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-attributes/#role): `content` |

## 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`
- [`className`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#classname): `false`
- [`html`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#html): `false`
- [`interactivity`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#interactivity):
  - `clientNavigation`: `true`
- `customCSS`: `false`
- [`visibility`](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#visibility): `false`

## Block Markup

This is a [**static block**](https://developer.wordpress.org/block-editor/getting-started/fundamentals/static-dynamic-rendering/). The markup is saved directly in the post content.

```html
<!-- wp:core/html -->
<h1>Some HTML code</h1>
<div>This is a div</div>
<!-- /wp:core/html -->
```

## Source

- [block.json](https://github.com/WordPress/gutenberg/tree/trunk/packages/block-library/src/html/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/html/) — browse `edit.js`, `save.js`, `index.php`, and more.

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