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sveltekit-document

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The missing document manager for SvelteKit

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# The missing document manager for SvelteKit

A tiny utility for SvelteKit that lets you change the `<html>`, `<head>`, and `<body>` tags from any page or layout—with full SSR support. Here's an example:

```svelte

<svelte:head>
    <title>Hello world!</title>
</svelte:head>
<svelte:body on:click={onBodyClick} />

<ska:html lang="en" on:keyup={onHtmlKeyup} />
<svelte:body class:dark={darkModeEnabled} />
```

The full list of features it offers is:

- Expands `<svelte:body>` to work with attributes, not just event listeners (accessible in SSR via `%ska.body.attributes%` in `app.html`), which addresses this [long-standing feature request](https://github.com/sveltejs/svelte/issues/3105)
- Adds `<ska:html>` (ska = SvelteKit Addons), which forwards attributes and event listeners to the `<html>` element (accessible in SSR via `%ska.html.attributes%` in `app.html`)

## Installation

1. Grab the package from NPM:

```sh
   npm install @sveltekit-addons/document --save-dev
   ```

1. Include the preprocessor in your `svelte.config.js` file:

```diff
   + import { preprocessor as documentPreprocessor } from '@sveltekit-addons/document'

export default {
   -   preprocess: [vitePreprocess()]
   +   preprocess: [vitePreprocess(), documentPreprocessor()] // Make sure it's at the very end
   }
   ```

1. Add the handle to your `src/hooks.server.js` (create that file if it doesn't exist):

- If you don't have any other handles:
     ```diff
     + export { handle } from '@sveltekit-addons/document/hooks'
     ```
   - If you have a `handle` export already:

```diff
     + import { handle as documentHandle } from '@sveltekit-addons/document/hooks'
     + import { sequence } from '@sveltejs/kit/hooks'

- export const handle = ...
     + const handle = ...
     + export const handle = sequence(handle, documentHandle)
     ```

1. Add the SSR placeholders to your `src/app.html`:

- Manually:
     ```diff
     <!DOCTYPE html>
     - <html>
     + <html %ska.html.attributes%>
     <head>
         ...
     </head>
     - <body>
     + <body %ska.body.attributes%>
     ```
   - Or by using the provided `app.html` template (meaning you can delete yours):

```diff
     // svelte.config.js
     + import { appTemplate } from '@sveltekit-addons/document'

export default {
         // ...
     +   kit: {
     +     files: {
     +       appTemplate
     +     }
     +   }
     }
     ```

## Gotchas

- `<ska:html>`'s event listeners don't get automatic types. Event listeners on the `<html>` element are pretty rare, though, and most of the time `<svelte:window>` could/should be used instead.

# Todo

- [ ] Handle CSP
- [ ] Allow adding elements portal-style to body

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