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

```ts
// Page.stories.ts|tsx

import React from 'react';

import type { ComponentStoryObj, ComponentMeta } from '@storybook/react';

import { Page } from './Page';

export default {
  /* 👇 The title prop is optional.
   * See https://storybook.js.org/docs/7.0/react/configure/overview#configure-story-loading
   * to learn how to generate automatic titles
   */
  title: 'Page',
  component: Page,
} as ComponentMeta<typeof Page>;

export const CustomFooter: ComponentStoryObj<typeof Page> = {
  render: (args) => (
    <Page {...args}>
      <footer>{args.footer}</footer>
    </Page>
  ),
  args: {
    footer: 'Built with Storybook',
  },
};
```