storybook/docs/snippets/react/page-story-slots.js.mdx

```js
// Page.stories.js | Page.stories.jsx

import React from 'react';

import Page from './Page';

export default {
  component: Page,
  title: 'Page',
};

const Template = (args) => (
  <Page {...args}>
    <footer>{args.footer}</footer>
  </Page>
);

export const CustomFooter = Template.bind({});
CustomFooter.args = {
  footer: 'Built with Storybook',
};
```