---
title: HTML attributes | Qwik Router
description: Learn how to add attributes to the html tag, in order to add "lang" or other custom attributes.
contributors:
  - bab2683
  - hamatoyogi
updated_at: '2023-08-23T23:06:42Z'
created_at: '2023-08-23T23:06:42Z'
---

# HTML attributes

Occasionally, it is necessary to add attributes to a website to enable specific functionalities, such as controlling the application's theme, determining text direction with the `dir` attribute, or setting the page language with the `lang` attribute. Typically, adding these attributes to the HTML tag is practical since it generally serves as the application's container.

To apply these attributes in Qwik router, add them to `containerAttributes` in the `src/entry.ssr.tsx` file:

```tsx
export default function (opts: RenderToStreamOptions) {
  return renderToStream(<Root />, {
    manifest,
    ...opts,
    // Use container attributes to set attributes on the html tag.
    containerAttributes: {
      lang: "en-us",
      ...opts.containerAttributes,
    },
  });
}
```

In addition, the `opts.serverData` object and nested objects allow you to access information about the request, including `request headers`, `url`, `route params`, and more. Leveraging this information enables you to do the following:

```tsx
export default function (opts: RenderToStreamOptions) {
  // With this route structure src/routes/[locale]/post/[id]/index.tsx
  const isRTL = opts.serverData?.qwikrouter.params.locale === 'ar';

  return renderToStream(<Root />, {
    manifest,
    ...opts,
    containerAttributes: {
      dir: isRTL ? 'rtl' : 'ltr'
      ...opts.containerAttributes,
    },
  });
}
```

