Refs can't be attached to stateless functional components.
@ -31,7 +31,7 @@ One common confusion is that Web Components use "class" instead of "className".
```javascript
function BrickFlipbox() {
return (
<brick-flipbox class="demo" ref="foo">
<brick-flipbox class="demo">
<div>front</div>
<div>back</div>
</brick-flipbox>