```md
<!-- MyComponent.stories.mdx -->

import { Meta, Story } from '@storybook/addon-docs';

import { INITIAL_VIEWPORTS } from '@storybook/addon-viewport';

import MyComponent from './MyComponent.svelte';

<Meta
  title="MyComponent"
  parameters={{
    viewport: {
      viewports: INITIAL_VIEWPORTS,
      defaultViewport: 'iphone6',
    },
  }}
  component={MyComponent} />

<!--
 👇 Render functions are a framework specific feature to allow you control on how the component renders.
  See https://storybook.js.org/docs/7.0/svelte/api/csf
  to learn how to use render functions.
-->

<Story
  name="MyStory"
  parameters={{
    viewport: {
      defaultViewport: 'iphonex',
    }
  }}
  render={(args) => ({
    Component: MyComponent,
    props: {},
  })} />
```