sync docs (#725)

* sync docs

* Update apps/svelte.dev/content/docs/cli/20-commands/10-sv-create.md

Author: Rich-Harris

apps/svelte.dev/content/docs/cli/20-commands/20-sv-add.md

@@ -33,7 +33,6 @@ You can select multiple space-separated add-ons from [the list below](#Official-
 - `paraglide`
 - `playwright`
 - `prettier`
-- `routify`
 - `storybook`
 - `tailwindcss`
 - `vitest`

apps/svelte.dev/content/docs/svelte/01-introduction/02-getting-started.md

@@ -21,7 +21,7 @@ There are also plugins for [Rollup](https://github.com/sveltejs/rollup-plugin-sv
 
 ## Editor tooling
 
-The Svelte team maintains a [VS Code extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode) and there are integrations with various other [editors](https://sveltesociety.dev/resources#editor-support) and tools as well.
+The Svelte team maintains a [VS Code extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode), and there are integrations with various other [editors](https://sveltesociety.dev/resources#editor-support) and tools as well.
 
 You can also check your code from the command line using [sv check](https://github.com/sveltejs/cli).
 

apps/svelte.dev/content/docs/svelte/01-introduction/03-svelte-files.md

@@ -50,7 +50,7 @@ A `<script>` tag with a `module` attribute runs once when the module first evalu
 
 You can `export` bindings from this block, and they will become exports of the compiled module. You cannot `export default`, since the default export is the component itself.
 
-> [!NOTE] If you are using TypeScript and import such exports from a `module` block into a `.ts` file, make sure to have your editor setup so that TypeScript knows about them. This is the case for our VS Code extension and the IntelliJ plugin, in other cases you might need to setup our [TypeScript editor plugin](https://www.npmjs.com/package/typescript-svelte-plugin).
+> [!NOTE] If you are using TypeScript and import such exports from a `module` block into a `.ts` file, make sure to have your editor setup so that TypeScript knows about them. This is the case for our VS Code extension and the IntelliJ plugin, but in other cases you might need to setup our [TypeScript editor plugin](https://www.npmjs.com/package/typescript-svelte-plugin).
 
 > [!LEGACY]
 > In Svelte 4, this script tag was created using `<script context="module">`

apps/svelte.dev/content/docs/svelte/02-runes/03-$derived.md

@@ -21,7 +21,7 @@ The expression inside `$derived(...)` should be free of side-effects. Svelte wil
 
 As with `$state`, you can mark class fields as `$derived`.
 
-> [!NOTE] Code in Svelte components is only executed once at creation, without the `$derived` rune `double` would maintain it's original value.
+> [!NOTE] Code in Svelte components is only executed once at creation. Without the `$derived` rune, `doubled` would maintain its original value even when `count` changes.
 
 ## `$derived.by`
 

apps/svelte.dev/content/docs/svelte/02-runes/04-$effect.md

@@ -243,8 +243,7 @@ export default function readable<T>(
 
 ## `$effect.root`
 
-The `$effect.root` rune is an advanced feature that creates a non-tracked scope that doesn't auto-cleanup. This is useful for
-nested effects that you want to manually control. This rune also allows for creation of effects outside of the component initialisation phase.
+The `$effect.root` rune is an advanced feature that creates a non-tracked scope that doesn't auto-cleanup. This is useful for nested effects that you want to manually control. This rune also allows for the creation of effects outside of the component initialisation phase.
 
 ```svelte
 <script>

apps/svelte.dev/content/docs/svelte/03-template-syntax/05-await.md

@@ -39,7 +39,7 @@ Await blocks allow you to branch on the three possible states of a [`Promise`](h
 
 > [!NOTE] During server-side rendering, only the pending branch will be rendered.
 >
-> If the provided expression is not a `Promise` only the `:then` branch will be rendered, including during server-side rendering.
+> If the provided expression is not a `Promise`, only the `:then` branch will be rendered, including during server-side rendering.
 
 The `catch` block can be omitted if you don't need to render anything when the promise rejects (or no error is possible).
 

apps/svelte.dev/content/docs/svelte/03-template-syntax/06-snippet.md

@@ -53,7 +53,7 @@ Snippets, and [render tags](@render), are a way to create reusable chunks of mar
 {/each}
 ```
 
-Like function declarations, snippets can have an arbitrary number of parameters, which can have default values, and you can destructure each parameter. You cannot use rest parameters however.
+Like function declarations, snippets can have an arbitrary number of parameters, which can have default values, and you can destructure each parameter. You cannot use rest parameters, however.
 
 ## Snippet scope
 

apps/svelte.dev/content/docs/svelte/03-template-syntax/15-animate.md

@@ -2,15 +2,12 @@
 title: animate:
 ---
 
-
-
-
 An animation is triggered when the contents of a [keyed each block](each#Keyed-each-blocks) are re-ordered. Animations do not run when an element is added or removed, only when the index of an existing data item within the each block changes. Animate directives must be on an element that is an _immediate_ child of a keyed each block.
 
 Animations can be used with Svelte's [built-in animation functions](svelte-animate) or [custom animation functions](#Custom-animation-functions).
 
 ```svelte
-<!-- When `list` is reordered the animation will run-->
+<!-- When `list` is reordered the animation will run -->
 {#each list as item, index (item)}
 	<li animate:flip>{item}</li>
 {/each}
@@ -115,4 +112,3 @@ A custom animation function can also return a `tick` function, which is called _
 	<div animate:whizz>{item}</div>
 {/each}
 ```
-

apps/svelte.dev/content/docs/svelte/04-styling/04-nested-style-elements.md

@@ -2,7 +2,7 @@
 title: Nested <style> elements
 ---
 
-There should only be 1 top-level `<style>` tag per component.
+There can only be one top-level `<style>` tag per component.
 
 However, it is possible to have a `<style>` tag nested inside other elements or logic blocks.
 

apps/svelte.dev/content/docs/svelte/05-special-elements/06-svelte-options.md

@@ -8,14 +8,19 @@ title: <svelte:options>
 
 The `<svelte:options>` element provides a place to specify per-component compiler options, which are detailed in the [compiler section](svelte-compiler#compile). The possible options are:
 
-- `immutable={true}` — you never use mutable data, so the compiler can do simple referential equality checks to determine if values have changed
-- `immutable={false}` — the default. Svelte will be more conservative about whether or not mutable objects have changed
-- `accessors={true}` — adds getters and setters for the component's props
-- `accessors={false}` — the default
 - `runes={true}` — forces a component into _runes mode_ (see the [Legacy APIs](legacy-overview) section)
 - `runes={false}` — forces a component into _legacy mode_
-- `namespace="..."` — the namespace where this component will be used, most commonly "svg"; use the "foreign" namespace to opt out of case-insensitive attribute names and HTML-specific warnings
+- `namespace="..."` — the namespace where this component will be used, can be "html" (the default), "svg" or "mathml"
 - `customElement={...}` — the [options](custom-elements#Component-options) to use when compiling this component as a custom element. If a string is passed, it is used as the `tag` option
+- `css="injected"` — the component will inject its styles inline: During server side rendering, it's injected as a `<style>` tag in the `head`, during client side rendering, it's loaded via JavaScript
+
+> [!LEGACY] Deprecated options
+> Svelte 4 also included the following options. They are deprecated in Svelte 5 and non-functional in runes mode.
+>
+> - `immutable={true}` — you never use mutable data, so the compiler can do simple referential equality checks to determine if values have changed
+> - `immutable={false}` — the default. Svelte will be more conservative about whether or not mutable objects have changed
+> - `accessors={true}` — adds getters and setters for the component's props
+> - `accessors={false}` — the default
 
 ```svelte
 <svelte:options customElement="my-custom-element" />

apps/svelte.dev/content/docs/svelte/06-runtime/01-stores.md

@@ -36,7 +36,7 @@ Local variables (that do not represent store values) must _not_ have a `$` prefi
 Prior to Svelte 5, stores were the go-to solution for creating cross-component reactive states or extracting logic. With runes, these use cases have greatly diminished.
 
 - when extracting logic, it's better to take advantage of runes' universal reactivity: You can use runes outside the top level of components and even place them into JavaScript or TypeScript files (using a `.svelte.js` or `.svelte.ts` file ending)
-- when creating shared state, you can create a `$state` object containing the values you need and manipulating said state
+- when creating shared state, you can create a `$state` object containing the values you need and then manipulate said state
 
 Stores are still a good solution when you have complex asynchronous data streams or it's important to have more manual control over updating values or listening to changes. If you're familiar with RxJs and want to reuse that knowledge, the `$` also comes in handy for you.
 

apps/svelte.dev/content/docs/svelte/06-runtime/03-lifecycle-hooks.md

@@ -7,7 +7,7 @@ title: Lifecycle hooks
 - beforeUpdate/afterUpdate with deprecation notice?
 - or skip this entirely and only have it in the reference docs? -->
 
-In Svelte 5, the component lifecycle consists of only two parts: Its creation and its destruction. Everything in-between - when certain state is updated - is not related to the component as a whole, only the parts that need to react to the state change are notified. This is because under the hood the smallest unit of change is actually not a component, it's the (render) effects that the component sets up upon component initialization. Consequently, there's no such thing as a "before update"/"after update" hook.
+In Svelte 5, the component lifecycle consists of only two parts: Its creation and its destruction. Everything in-between — when certain state is updated — is not related to the component as a whole; only the parts that need to react to the state change are notified. This is because under the hood the smallest unit of change is actually not a component, it's the (render) effects that the component sets up upon component initialization. Consequently, there's no such thing as a "before update"/"after update" hook.
 
 ## `onMount`
 

apps/svelte.dev/content/docs/svelte/98-reference/.generated/compile-errors.md

@@ -119,7 +119,7 @@ Can only bind to state or props
 ### block_invalid_continuation_placement
 
 ```
-{:...} block is invalid at this position (did you forget to close the preceeding element or block?)
+{:...} block is invalid at this position (did you forget to close the preceding element or block?)
 ```
 
 ### block_invalid_elseif

apps/svelte.dev/content/docs/svelte/98-reference/21-svelte-compiler.md

@@ -78,10 +78,12 @@ May throw an error if the code is too complex to migrate automatically.
 function migrate(
 	source: string,
 	{
-		filename
+		filename,
+		use_ts
 	}?:
 		| {
 				filename?: string;
+				use_ts?: boolean;
 		  }
 		| undefined
 ): {

apps/svelte.dev/content/docs/svelte/98-reference/30-compiler-errors.md

@@ -123,7 +123,7 @@ Can only bind to state or props
 ### block_invalid_continuation_placement
 
 ```
-{:...} block is invalid at this position (did you forget to close the preceeding element or block?)
+{:...} block is invalid at this position (did you forget to close the preceding element or block?)
 ```
 
 ### block_invalid_elseif

apps/svelte.dev/content/docs/svelte/99-legacy/00-legacy-overview.md

@@ -10,3 +10,5 @@ The following pages document these features for
 - people using Svelte 5, but with components that haven't yet been migrated
 
 Since Svelte 3/4 syntax still works in Svelte 5, we will distinguish between _legacy mode_ and _runes mode_. Once a component is in runes mode (which you can opt into by using runes, or by explicitly setting the `runes: true` compiler option), legacy mode features are no longer available.
+
+If you're exclusively interested in the Svelte 3/4 syntax, you can browse its documentation at [v4.svelte.dev](https://v4.svelte.dev).