# Wrapper (iframe sandbox)
Links: [Home](../index.md)
Creates isolated iframe environments for running sandboxed content. Used internally by heavy modules like PDF Reader, SVG Editor, and the Code Editor to prevent global namespace pollution.
## Loading the Module
```js
Application.require("gadgets/wrapper").then(function (Wrapper) {
// Wrapper is a constructor function
});
```
**Dependency:** `extensions/prototype`
## API
### `Wrapper(config)`
Create a new sandboxed iframe.
```js
var w = Wrapper({
base: true,
header: '',
code: 'Hello from iframe
'
});
```
**Config options:**
| Option | Type | Default | Description |
|---|---|---|---|
| `base` | `boolean / string` | `true` | Set ``. `true` uses current page URL |
| `header` | `string` | `''` | Extra HTML injected into `` |
| `code` | `string` | `''` | HTML content for `` |
### Instance Methods
| Method | Returns | Description |
|---|---|---|
| `node()` | `HTMLIFrameElement` | Get the iframe element |
| `container()` | `HTMLBodyElement` | Get the iframe's `document.body` |
| `document()` | `Document` | Get the iframe's `document` object |
| `window()` | `Window` | Get the iframe's `window` object |
| `whenLoaded()` | `Promise` | Resolves when the iframe is fully loaded |
## Use Cases
### Run untrusted HTML in a sandbox
```js
Application.require("gadgets/wrapper").then(function (Wrapper) {
var sandbox = Wrapper({
code: 'Waiting...