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Basic Svelte
Introduction
Reactivity
Props
Logic
Events
Bindings
Classes and styles
Actions
Transitions
Advanced Svelte
Advanced reactivity
Reusing content
Motion
Advanced bindings
Advanced transitions
Context API
Special elements
<script module>
Next steps
Basic SvelteKit
Introduction
Routing
Loading data
Headers and cookies
Shared modules
Forms
API routes
$app/state
Errors and redirects
Advanced SvelteKit
Hooks
Page options
Link options
Advanced routing
Advanced loading
Environment variables
Conclusion
Advanced Svelte Special elements <svelte:html>

The <svelte:html> element allows you to listen to events and set attributes on the <html>. This is useful to for example set the lang tag dynamically, or to update classes that influence the whole page.

Add a conditional class attribute to the <svelte:html> tag...

App
<svelte:html
	class={darkmode ? 'dark' : 'light'}
/>

...and click the button to toggle the mode.

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<svelte:body>
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<script>
	let darkmode = $state(false);
</script>
 
<svelte:html />
 
<button onclick={() => darkmode = !darkmode}>toggle dark mode</button>