2023-07-05 15:11:16 +02:00
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---
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title: 'Viewport `meta` tags should not be used in `_document.js` `<Head>`'
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---
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2020-07-07 07:43:16 +02:00
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2023-07-05 15:11:16 +02:00
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## Why This Error Occurred
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2020-07-07 07:43:16 +02:00
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Adding `<meta name="viewport" ...>` in `pages/_document.js` will lead to unexpected results since it cannot be deduped.
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The viewport tag should be handled by `next/head` in `pages/_app.js`.
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2023-07-05 15:11:16 +02:00
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## Possible Ways to Fix It
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2020-07-07 07:43:16 +02:00
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Set your viewport `meta` tag in `pages/_app.js` instead:
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2023-07-05 15:11:16 +02:00
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```tsx filename="pages/_app.js"
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2020-07-07 07:43:16 +02:00
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import Head from 'next/head'
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function MyApp({ Component, pageProps }) {
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return (
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<>
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<Head>
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<meta name="viewport" content="viewport-fit=cover" />
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</Head>
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<Component {...pageProps} />
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</>
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)
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}
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export default MyApp
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```
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2023-07-05 15:11:16 +02:00
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## Useful Links
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2020-07-07 07:43:16 +02:00
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2021-01-07 14:41:04 +01:00
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- [Issue #13230](https://github.com/vercel/next.js/issues/13230), which led to the creation of this warning.
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