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Since Inertia powered JavaScript apps are rendered within the document <body>, they are unable to render markup to the document <head>, as it’s outside of their scope. To help with this, Inertia ships with a <Head> component which can be used to set the page <title>, <meta> tags, and other <head> elements. The <Head> component will only replace <head> elements that are not in your server-side root template. The <Head> component is not available in the Svelte adapter, as Svelte already ships with its own <svelte:head> component.

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Head Component

To add <head> elements to your page, use the <Head> component. Within this component, you can include the elements that you wish to add to the document <head>. 
import { Head } from '@inertiajs/vue3'

<Head>
    <title>Your page title</title>
    <meta name="description" content="Your page description">
</Head>

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Title Shorthand

If you only need to add a <title> to the document <head>, you may simply pass the title as a prop to the <Head> component. 
import { Head } from '@inertiajs/vue3'

<Head title="Your page title" />

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Title Callback

You can globally modify the page <title> using the title callback in the createInertiaApp setup method. Typically, this method is invoked in your application’s main JavaScript file. A common use case for the title callback is automatically adding an app name before or after each page title. 
createInertiaApp({
  title: (title) => `${title} - My App`,
  // ...
});
After defining the title callback, the callback will automatically be invoked when you set a title using the <Head> component. 
import { Head } from '@inertiajs/vue3'

<Head title="Home">
Which, in this example, will result in the following <title> tag. 
<title>Home - My App</title>
The title callback will also be invoked when you set the title using a <title> tag within your <Head> component. 
import { Head } from '@inertiajs/vue3'

<Head>
    <title>Home</title>
</Head>

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Multiple Head Instances

It’s possible to have multiple instances of the <Head> component throughout your application. For example, your layout can set some default <Head> elements, and then your individual pages can override those defaults. 
// Layout.vue import { Head } from '@inertiajs/vue3'

<Head>
    <title>My app</title>
    <meta head-key="description" name="description" content="This is the default description" />
    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
</Head>

// About.vue import { Head } from '@inertiajs/vue3'

<Head>
    <title>About - My app</title>
    <meta head-key="description" name="description" content="This is a page specific description" />
</Head>
Inertia will only ever render one <title> tag; however, all other tags will be stacked since it’s valid to have multiple instances of them. To avoid duplicate tags in your <head>, you can use the head-key property, which will make sure the tag is only rendered once. This is illustrated in the example above for the <meta name="description"> tag. The code example above will render the following HTML. 
<head>
  <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
  <title>About - My app</title>
  <meta name="description" content="This is a page specific description" />
</head>

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Head Extension

When building a real application, it can sometimes be helpful to create a custom head component that extends Inertia’s <Head> component. This gives you a place to set app-wide defaults, such as appending the app name to the page title. 
<!-- AppHead.vue -->

<script setup>
import { Head } from "@inertiajs/vue3";

defineProps({ title: String });
</script>

<template>
  <Head :title="title ? `${title} - My App` : 'My App'">
    <slot />
  </Head>
</template>
Once you have created the custom component, you can just start using it in your pages. 
import AppHead from './AppHead'

<AppHead title="About" />

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Server-Side Head Elements

You may wish to include default head elements like <title> or <meta> tags in your root Blade template. This creates two challenges: preventing duplicates when SSR is active, and ensuring the client-side <Head> component may replace them during navigation.

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SSR Fallback

The <x-inertia::head> Blade component accepts fallback content via its slot. This content is only rendered in the initial HTML when SSR is not active. When SSR is active, the <Head> component already provides these elements as part of the server-rendered response, so the fallback is skipped.
resources/views/app.blade.php
<head>
    @vite('resources/js/app.js')
    <x-inertia::head>
        <title>{{ config('app.name') }}</title>
        <meta name="description" content="My application description">
    </x-inertia::head>
</head>

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The data-inertia Attribute

The client-side <Head> component tracks the elements it manages by marking them with a data-inertia attribute. By default, it leaves any other tags in your Blade template untouched. Since there may only be one <title> tag, the <Head> component will always replace it. Other elements like <meta> and <link> may have multiple instances, so the component needs a way to identify which ones it should manage. You may add the data-inertia attribute to elements in your Blade template to have the <Head> component adopt them. On the first client-side navigation, it will match these elements by key and replace or remove them as needed.
resources/views/app.blade.php
<head>
    @vite('resources/js/app.js')
    <title>{{ config('app.name') }}</title>
    <meta data-inertia="description" name="description" content="My application description">
</head>
The data-inertia value corresponds to the head-key property on your client-side <Head> elements.