Use the `type` attribute with the value `checkbox` to create a menu item that will toggle on and off when selected.
**Hint:** use the `checked` attribute to set the initial state.

```html
<div class="w-[180px]">
  <sd-menu>
    <sd-menu-item type="checkbox" checked>Menu item 1</sd-menu-item>
    <sd-menu-item type="checkbox" checked>Menu item 2</sd-menu-item>
    <sd-menu-item type="checkbox">Menu item 3</sd-menu-item>
  </sd-menu>
</div>
```