### Popout menu

Reveals an interactive popout menu on hover.

#### HTML

```html
<div class="reference">
  <div class="popout-menu">
    Popout menu
  </div>
</div>
```

#### CSS

```css
.reference {
  position: relative;
}
.popout-menu {
  position: absolute;
  visibility: hidden;
  left: 100%;
}
.reference:hover > .popout-menu {
  visibility: visible;
}
```

#### Demo

<div class="snippet-demo">
  <div class="snippet-demo__reference">
    <div class="snippet-demo__popout-menu">
      Popout menu
    </div>
  </div>
</div>

<style>
.snippet-demo__reference {
  background: linear-gradient(135deg, #ff4c9f, #ff7b74);
  height: 75px;
  width: 75px;
  position: relative;
  will-change: transform;
}
.snippet-demo__popout-menu {
  position: absolute;
  visibility: hidden;
  left: 100%;
  background: #333;
  color: white;
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
  width: 100px;
  text-align: center;
}
.snippet-demo__reference:hover > .snippet-demo__popout-menu {
  visibility: visible;
}
</style>

#### Explanation

1. `position: relative` on the reference parent establishes a Cartesian positioning context for its child.
2. `position: absolute` takes the popout menu out of the flow of the document and positions it
   in relation to the parent.
3. `left: 100%` moves the the popout menu 100% of its parent's width from the left.
4. `visibility: hidden` hides the popout menu initially and allows for transitions (unlike `display: none`).
5. `.reference:hover > .popout-menu` means that when `.reference` is hovered over, select immediate
   children with a class of `.popout-menu` and change their `visibility` to `visible`, which shows the popout.

#### Browser support

<span class="snippet__support-note">✅ No caveats.</span>