Svelte Components

Svelte Components

Quick Start

Component libraries: Bits UI (headless) | Ark UI | Melt UI (primitives)

Form trick: Use form attribute when form can't wrap inputs:

<form id="my-form" action="/submit"><!-- outside table --></form>
<table>
	<tr>
		<td><input form="my-form" name="email" /></td>
		<td><button form="my-form">Submit</button></td>
	</tr>
</table>

Web Components

// svelte.config.js
export default {
	compilerOptions: {
		customElement: true,
	},
};

<!-- MyButton.svelte -->
<svelte:options customElement="my-button" />

<!-- Native <slot> is appropriate inside custom elements. -->
<button><slot /></button>

Reference Files

• component-libraries.md - Bits UI, Ark UI setup
• web-components.md - Building custom elements
• form-patterns.md - Advanced form handling

Notes

• Bits UI 1.0: flexible, unstyled, accessible components for Svelte
• Form defaultValue attribute enables easy form resets
• Use snippets to wrap rich HTML in custom select options
• Use snippets/{@render} for normal Svelte component content; native <slot> is for custom elements
• Last verified: 2026-05-14