To use auto-detected controls with Web components, you must fill in the `component` field in your story metadata:

```ts
export default {
  title: 'Button',
  component: 'button', // name of your button component
};
```

Storybook uses this to auto-generate the `ArgTypes` for your component using your [custom-elements.json](https://github.com/webcomponents/custom-elements-json) file.

You'll need to register that in `.storybook/preview.js`:

```js
import { setCustomElements } from '@storybook/web-components';
import customElements from '../custom-elements.json';

setCustomElements(customElements);
```

You can generate a `custom-elements.json` using either [web-component-analyzer](https://github.com/runem/web-component-analyzer) or [stenciljs](https://stenciljs.com/) (if you're using Stencil).