From 6448e07521a76bccaa387feb8291cc11ec248ca3 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 16 Aug 2024 06:41:52 -0400
Subject: [PATCH] breaking: remove foreign namespace (#12869)

* breaking: remove foreign namespace

* regenerate
---
 .changeset/gorgeous-coats-jog.md              |  5 ++
 .../compiler/phases/1-parse/read/options.js   | 12 +----
 .../2-analyze/visitors/BindDirective.js       |  4 --
 .../2-analyze/visitors/RegularElement.js      | 14 ++----
 .../phases/2-analyze/visitors/shared/a11y.js  |  3 --
 .../2-analyze/visitors/shared/element.js      |  2 +-
 .../client/visitors/RegularElement.js         | 44 ++---------------
 .../client/visitors/SvelteElement.js          |  2 +-
 .../client/visitors/shared/element.js         |  6 +--
 .../server/visitors/RegularElement.js         |  5 +-
 .../server/visitors/shared/element.js         |  2 +-
 .../src/compiler/phases/3-transform/utils.js  | 48 ++++++++-----------
 packages/svelte/src/compiler/types/index.d.ts |  2 +-
 .../svelte/src/compiler/types/template.d.ts   |  5 +-
 .../svelte/src/compiler/validate-options.js   |  2 +-
 .../_config.js                                | 26 ----------
 .../main.svelte                               |  4 --
 .../_config.js                                | 20 --------
 .../main.svelte                               |  4 --
 .../a11y-in-foreign-namespace/input.svelte    |  7 ---
 .../a11y-in-foreign-namespace/warnings.json   |  1 -
 .../errors.json                               | 14 ------
 .../input.svelte                              |  6 ---
 .../samples/namespace-invalid/errors.json     |  2 +-
 .../samples/namespace-non-literal/errors.json |  2 +-
 packages/svelte/tests/validator/test.ts       | 18 +------
 packages/svelte/types/index.d.ts              | 14 ++----
 27 files changed, 52 insertions(+), 222 deletions(-)
 create mode 100644 .changeset/gorgeous-coats-jog.md
 delete mode 100644 packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/_config.js
 delete mode 100644 packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/main.svelte
 delete mode 100644 packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/_config.js
 delete mode 100644 packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/main.svelte
 delete mode 100644 packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/input.svelte
 delete mode 100644 packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/warnings.json
 delete mode 100644 packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/errors.json
 delete mode 100644 packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/input.svelte

diff --git a/.changeset/gorgeous-coats-jog.md b/.changeset/gorgeous-coats-jog.md
new file mode 100644
index 0000000000..0b69c9a966
--- /dev/null
+++ b/.changeset/gorgeous-coats-jog.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+breaking: remove foreign namespace
diff --git a/packages/svelte/src/compiler/phases/1-parse/read/options.js b/packages/svelte/src/compiler/phases/1-parse/read/options.js
index a8ba7e216c..cd3673aa57 100644
--- a/packages/svelte/src/compiler/phases/1-parse/read/options.js
+++ b/packages/svelte/src/compiler/phases/1-parse/read/options.js
@@ -157,18 +157,10 @@ export default function read_options(node) {
 					component_options.namespace = 'svg';
 				} else if (value === NAMESPACE_MATHML) {
 					component_options.namespace = 'mathml';
-				} else if (
-					value === 'html' ||
-					value === 'mathml' ||
-					value === 'svg' ||
-					value === 'foreign'
-				) {
+				} else if (value === 'html' || value === 'mathml' || value === 'svg') {
 					component_options.namespace = value;
 				} else {
-					e.svelte_options_invalid_attribute_value(
-						attribute,
-						`"html", "mathml", "svg" or "foreign"`
-					);
+					e.svelte_options_invalid_attribute_value(attribute, `"html", "mathml" or "svg"`);
 				}
 
 				break;
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
index 573616b815..43d1a3d468 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
@@ -126,10 +126,6 @@ export function BindDirective(node, context) {
 		parent?.type === 'SvelteDocument' ||
 		parent?.type === 'SvelteBody'
 	) {
-		if (context.state.options.namespace === 'foreign' && node.name !== 'this') {
-			e.bind_invalid_name(node, node.name, 'Foreign elements only support `bind:this`');
-		}
-
 		if (node.name in binding_properties) {
 			const property = binding_properties[node.name];
 			if (property.valid_elements && !property.valid_elements.includes(parent.name)) {
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/RegularElement.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/RegularElement.js
index 5c15f70ba2..16be82ed2c 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/RegularElement.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/RegularElement.js
@@ -24,11 +24,7 @@ export function RegularElement(node, context) {
 	context.state.analysis.elements.push(node);
 
 	// Special case: Move the children of <textarea> into a value attribute if they are dynamic
-	if (
-		context.state.options.namespace !== 'foreign' &&
-		node.name === 'textarea' &&
-		node.fragment.nodes.length > 0
-	) {
+	if (node.name === 'textarea' && node.fragment.nodes.length > 0) {
 		for (const attribute of node.attributes) {
 			if (attribute.type === 'Attribute' && attribute.name === 'value') {
 				e.textarea_invalid_content(node);
@@ -65,7 +61,6 @@ export function RegularElement(node, context) {
 	// Special case: single expression tag child of option element -> add "fake" attribute
 	// to ensure that value types are the same (else for example numbers would be strings)
 	if (
-		context.state.options.namespace !== 'foreign' &&
 		node.name === 'option' &&
 		node.fragment.nodes?.length === 1 &&
 		node.fragment.nodes[0].type === 'ExpressionTag' &&
@@ -90,10 +85,8 @@ export function RegularElement(node, context) {
 		(attribute) => attribute.type === 'SpreadAttribute'
 	);
 
-	if (context.state.options.namespace !== 'foreign') {
-		node.metadata.svg = is_svg(node.name);
-		node.metadata.mathml = is_mathml(node.name);
-	}
+	node.metadata.svg = is_svg(node.name);
+	node.metadata.mathml = is_mathml(node.name);
 
 	if (context.state.parent_element) {
 		let past_parent = false;
@@ -156,7 +149,6 @@ export function RegularElement(node, context) {
 
 	if (
 		context.state.analysis.source[node.end - 2] === '/' &&
-		context.state.options.namespace !== 'foreign' &&
 		!is_void(node_name) &&
 		!is_svg(node_name)
 	) {
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
index 2213ae102a..a1a143e0c6 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
@@ -687,9 +687,6 @@ function get_static_text_value(attribute) {
  * @param {AnalysisState} state
  */
 export function check_element(node, state) {
-	// foreign namespace means elements can have completely different meanings, therefore we don't check them
-	if (state.options.namespace === 'foreign') return;
-
 	/** @type {Map<string, Attribute>} */
 	const attribute_map = new Map();
 
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/element.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/element.js
index 0771f74ccf..59f02b98a1 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/element.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/element.js
@@ -79,7 +79,7 @@ export function validate_element(node, context) {
 				validate_slot_attribute(context, attribute);
 			}
 
-			if (attribute.name === 'is' && context.state.options.namespace !== 'foreign') {
+			if (attribute.name === 'is') {
 				w.attribute_avoid_is(attribute);
 			}
 
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js
index f05514a6a2..0cf8640fef 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js
@@ -178,14 +178,6 @@ export function RegularElement(node, context) {
 		}
 	}
 
-	if (child_metadata.namespace === 'foreign') {
-		// input/select etc could mean something completely different in foreign namespace, so don't special-case them
-		needs_content_reset = false;
-		needs_input_reset = false;
-		needs_special_value_handling = false;
-		value_binding = null;
-	}
-
 	if (is_content_editable && has_content_editable_binding) {
 		child_metadata.bound_contenteditable = true;
 	}
@@ -219,7 +211,7 @@ export function RegularElement(node, context) {
 			node,
 			node_id,
 			// If value binding exists, that one takes care of calling $.init_select
-			value_binding === null && node.name === 'select' && child_metadata.namespace !== 'foreign'
+			value_binding === null && node.name === 'select'
 		);
 		is_attributes_reactive = true;
 	} else {
@@ -249,8 +241,6 @@ export function RegularElement(node, context) {
 				const value = is_text_attribute(attribute) ? attribute.value[0].data : true;
 
 				if (name !== 'class' || value) {
-					// TODO namespace=foreign probably doesn't want to do template stuff at all and instead use programmatic methods
-					// to create the elements it needs.
 					context.state.template.push(
 						` ${attribute.name}${
 							is_boolean_attribute(name) && value === true
@@ -262,10 +252,9 @@ export function RegularElement(node, context) {
 				}
 			}
 
-			const is =
-				is_custom_element && child_metadata.namespace !== 'foreign'
-					? build_custom_element_attribute_update_assignment(node_id, attribute, context)
-					: build_element_attribute_update_assignment(node, node_id, attribute, context);
+			const is = is_custom_element
+				? build_custom_element_attribute_update_assignment(node_id, attribute, context)
+				: build_element_attribute_update_assignment(node, node_id, attribute, context);
 			if (is) is_attributes_reactive = true;
 		}
 	}
@@ -301,8 +290,7 @@ export function RegularElement(node, context) {
 		locations: child_locations,
 		scope: /** @type {Scope} */ (context.state.scopes.get(node.fragment)),
 		preserve_whitespace:
-			context.state.preserve_whitespace ||
-			((node.name === 'pre' || node.name === 'textarea') && child_metadata.namespace !== 'foreign')
+			context.state.preserve_whitespace || node.name === 'pre' || node.name === 'textarea'
 	};
 
 	const { hoisted, trimmed } = clean_nodes(
@@ -587,28 +575,6 @@ function build_element_attribute_update_assignment(element, node_id, attribute,
 	const is_mathml = context.state.metadata.namespace === 'mathml';
 	let { has_call, value } = build_attribute_value(attribute.value, context);
 
-	// The foreign namespace doesn't have any special handling, everything goes through the attr function
-	if (context.state.metadata.namespace === 'foreign') {
-		const statement = b.stmt(
-			b.call(
-				'$.set_attribute',
-				node_id,
-				b.literal(name),
-				value,
-				is_ignored(element, 'hydration_attribute_changed') && b.true
-			)
-		);
-
-		if (attribute.metadata.expression.has_state) {
-			const id = state.scope.generate(`${node_id.name}_${name}`);
-			build_update_assignment(state, id, undefined, value, statement);
-			return true;
-		} else {
-			state.init.push(statement);
-			return false;
-		}
-	}
-
 	if (name === 'autofocus') {
 		state.init.push(b.stmt(b.call('$.autofocus', node_id, value)));
 		return false;
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js
index 90e74259f1..01aff61b87 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js
@@ -94,7 +94,7 @@ export function SvelteElement(node, context) {
 
 	const get_tag = b.thunk(/** @type {Expression} */ (context.visit(node.tag)));
 
-	if (dev && context.state.metadata.namespace !== 'foreign') {
+	if (dev) {
 		if (node.fragment.nodes.length > 0) {
 			context.state.init.push(b.stmt(b.call('$.validate_void_dynamic_element', get_tag)));
 		}
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js
index 7d5c61c056..c3db0edb0a 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js
@@ -116,11 +116,7 @@ export function build_attribute_value(value, context) {
  * @param {{ state: { metadata: { namespace: Namespace }}}} context
  */
 export function get_attribute_name(element, attribute, context) {
-	if (
-		!element.metadata.svg &&
-		!element.metadata.mathml &&
-		context.state.metadata.namespace !== 'foreign'
-	) {
+	if (!element.metadata.svg && !element.metadata.mathml) {
 		return normalize_attribute(attribute.name);
 	}
 
diff --git a/packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js b/packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js
index 642b9ba430..0fcbe17bdf 100644
--- a/packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js
+++ b/packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js
@@ -21,8 +21,7 @@ export function RegularElement(node, context) {
 		...context.state,
 		namespace,
 		preserve_whitespace:
-			context.state.preserve_whitespace ||
-			((node.name === 'pre' || node.name === 'textarea') && namespace !== 'foreign')
+			context.state.preserve_whitespace || node.name === 'pre' || node.name === 'textarea'
 	};
 
 	context.state.template.push(b.literal(`<${node.name}`));
@@ -95,7 +94,7 @@ export function RegularElement(node, context) {
 		);
 	}
 
-	if (!is_void(node.name) || namespace === 'foreign') {
+	if (!is_void(node.name)) {
 		state.template.push(b.literal(`</${node.name}>`));
 	}
 
diff --git a/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/element.js b/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/element.js
index fc99b87822..2d2d67991d 100644
--- a/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/element.js
+++ b/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/element.js
@@ -268,7 +268,7 @@ export function build_element_attributes(node, context) {
  */
 function get_attribute_name(element, attribute, context) {
 	let name = attribute.name;
-	if (!element.metadata.svg && !element.metadata.mathml && context.state.namespace !== 'foreign') {
+	if (!element.metadata.svg && !element.metadata.mathml) {
 		name = name.toLowerCase();
 		// don't lookup boolean aliases here, the server runtime function does only
 		// check for the lowercase variants of boolean attributes
diff --git a/packages/svelte/src/compiler/phases/3-transform/utils.js b/packages/svelte/src/compiler/phases/3-transform/utils.js
index f71c4120f9..d8b1bb9c5e 100644
--- a/packages/svelte/src/compiler/phases/3-transform/utils.js
+++ b/packages/svelte/src/compiler/phases/3-transform/utils.js
@@ -306,32 +306,30 @@ export function clean_nodes(
  * @param {Compiler.SvelteNode[]} nodes
  */
 export function infer_namespace(namespace, parent, nodes) {
-	if (namespace !== 'foreign') {
-		if (parent.type === 'RegularElement' && parent.name === 'foreignObject') {
-			return 'html';
-		}
+	if (parent.type === 'RegularElement' && parent.name === 'foreignObject') {
+		return 'html';
+	}
 
-		if (parent.type === 'RegularElement' || parent.type === 'SvelteElement') {
-			if (parent.metadata.svg) {
-				return 'svg';
-			}
-			return parent.metadata.mathml ? 'mathml' : 'html';
+	if (parent.type === 'RegularElement' || parent.type === 'SvelteElement') {
+		if (parent.metadata.svg) {
+			return 'svg';
 		}
+		return parent.metadata.mathml ? 'mathml' : 'html';
+	}
 
-		// Re-evaluate the namespace inside slot nodes that reset the namespace
-		if (
-			parent.type === 'Fragment' ||
-			parent.type === 'Root' ||
-			parent.type === 'Component' ||
-			parent.type === 'SvelteComponent' ||
-			parent.type === 'SvelteFragment' ||
-			parent.type === 'SnippetBlock' ||
-			parent.type === 'SlotElement'
-		) {
-			const new_namespace = check_nodes_for_namespace(nodes, 'keep');
-			if (new_namespace !== 'keep' && new_namespace !== 'maybe_html') {
-				return new_namespace;
-			}
+	// Re-evaluate the namespace inside slot nodes that reset the namespace
+	if (
+		parent.type === 'Fragment' ||
+		parent.type === 'Root' ||
+		parent.type === 'Component' ||
+		parent.type === 'SvelteComponent' ||
+		parent.type === 'SvelteFragment' ||
+		parent.type === 'SnippetBlock' ||
+		parent.type === 'SlotElement'
+	) {
+		const new_namespace = check_nodes_for_namespace(nodes, 'keep');
+		if (new_namespace !== 'keep' && new_namespace !== 'maybe_html') {
+			return new_namespace;
 		}
 	}
 
@@ -401,10 +399,6 @@ function check_nodes_for_namespace(nodes, namespace) {
  * @returns {Compiler.Namespace}
  */
 export function determine_namespace_for_children(node, namespace) {
-	if (namespace === 'foreign') {
-		return namespace;
-	}
-
 	if (node.name === 'foreignObject') {
 		return 'html';
 	}
diff --git a/packages/svelte/src/compiler/types/index.d.ts b/packages/svelte/src/compiler/types/index.d.ts
index d893f62b33..587c9e373c 100644
--- a/packages/svelte/src/compiler/types/index.d.ts
+++ b/packages/svelte/src/compiler/types/index.d.ts
@@ -85,7 +85,7 @@ export interface CompileOptions extends ModuleCompileOptions {
 	 */
 	accessors?: boolean;
 	/**
-	 * The namespace of the element; e.g., `"html"`, `"svg"`, `"foreign"`.
+	 * The namespace of the element; e.g., `"html"`, `"svg"`, `"mathml"`.
 	 *
 	 * @default 'html'
 	 */
diff --git a/packages/svelte/src/compiler/types/template.d.ts b/packages/svelte/src/compiler/types/template.d.ts
index 9971af9977..c803dfbba9 100644
--- a/packages/svelte/src/compiler/types/template.d.ts
+++ b/packages/svelte/src/compiler/types/template.d.ts
@@ -47,11 +47,8 @@ export interface Fragment {
  * - `html`    — the default, for e.g. `<div>` or `<span>`
  * - `svg`     — for e.g. `<svg>` or `<g>`
  * - `mathml`  — for e.g. `<math>` or `<mrow>`
- * - `foreign` — for other compilation targets than the web, e.g. Svelte Native.
- *               Disallows bindings other than bind:this, disables a11y checks, disables any special attribute handling
- *               (also see https://github.com/sveltejs/svelte/pull/5652)
  */
-export type Namespace = 'html' | 'svg' | 'mathml' | 'foreign';
+export type Namespace = 'html' | 'svg' | 'mathml';
 
 export interface Root extends BaseNode {
 	type: 'Root';
diff --git a/packages/svelte/src/compiler/validate-options.js b/packages/svelte/src/compiler/validate-options.js
index 4ef33afc83..807f205d42 100644
--- a/packages/svelte/src/compiler/validate-options.js
+++ b/packages/svelte/src/compiler/validate-options.js
@@ -90,7 +90,7 @@ export const validate_component_options =
 
 			name: string(undefined),
 
-			namespace: list(['html', 'svg', 'foreign']),
+			namespace: list(['html', 'mathml', 'svg']),
 
 			modernAst: boolean(false),
 
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/_config.js b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/_config.js
deleted file mode 100644
index 3ed155c254..0000000000
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/_config.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import { test } from '../../test';
-
-export default test({
-	// TODO: needs fixing. Can only be fixed once we also support document.createElementNS-style creation of elements
-	// because the $.template('...') approach has no option to preserve attribute name casing
-	skip: true,
-
-	html: `
-		<page horizontalAlignment="center">
-			<button textWrap="true" text="button"></button>
-			<text wordWrap="true"></text>
-		</page>
-	`,
-
-	compileOptions: {
-		namespace: 'foreign'
-	},
-
-	test({ assert, target }) {
-		// @ts-ignore
-		const attr = (/** @type {string} */ sel) => target.querySelector(sel).attributes[0].name;
-		assert.equal(attr('page'), 'horizontalAlignment');
-		assert.equal(attr('button'), 'textWrap');
-		assert.equal(attr('text'), 'wordWrap');
-	}
-});
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/main.svelte b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/main.svelte
deleted file mode 100644
index 2cf9c74171..0000000000
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace-compiler-option/main.svelte
+++ /dev/null
@@ -1,4 +0,0 @@
-<page horizontalAlignment="center">
-	<button textWrap="true" text="button"></button>
-	<text wordWrap="true" />
-</page>
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/_config.js b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/_config.js
deleted file mode 100644
index 5321756cef..0000000000
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/_config.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { test } from '../../test';
-
-export default test({
-	// TODO: needs fixing. Can only be fixed once we also support document.createElementNS-style creation of elements
-	// because the $.template('...') approach has no option to preserve attribute name casing
-	skip: true,
-
-	html: `
-		<page horizontalAlignment="center">
-			<button textWrap="true" text="button">
-		</page>
-	`,
-
-	test({ assert, target }) {
-		// @ts-ignore
-		const attr = (/** @type {string} */ sel) => target.querySelector(sel).attributes[0].name;
-		assert.equal(attr('page'), 'horizontalAlignment');
-		assert.equal(attr('button'), 'textWrap');
-	}
-});
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/main.svelte b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/main.svelte
deleted file mode 100644
index 3962f64b12..0000000000
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-foreign-namespace/main.svelte
+++ /dev/null
@@ -1,4 +0,0 @@
-<svelte:options namespace="foreign" />
-<page horizontalAlignment="center">
-	<button textWrap="true" text="button">
-</page>
diff --git a/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/input.svelte b/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/input.svelte
deleted file mode 100644
index aeef580c73..0000000000
--- a/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/input.svelte
+++ /dev/null
@@ -1,7 +0,0 @@
-<svelte:options namespace="foreign" />
-<page>
-    <a>not actually a link</a>
-    <label>This isn't a html label</label>
-    <figure>This is maybe a QT figure</figure>
-</page>
-
diff --git a/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/warnings.json b/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/warnings.json
deleted file mode 100644
index fe51488c70..0000000000
--- a/packages/svelte/tests/validator/samples/a11y-in-foreign-namespace/warnings.json
+++ /dev/null
@@ -1 +0,0 @@
-[]
diff --git a/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/errors.json b/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/errors.json
deleted file mode 100644
index 702a6a6042..0000000000
--- a/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/errors.json
+++ /dev/null
@@ -1,14 +0,0 @@
-[
-	{
-		"code": "bind_invalid_name",
-		"message": "`bind:value` is not a valid binding. Foreign elements only support `bind:this`",
-		"start": {
-			"line": 6,
-			"column": 7
-		},
-		"end": {
-			"line": 6,
-			"column": 28
-		}
-	}
-]
diff --git a/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/input.svelte b/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/input.svelte
deleted file mode 100644
index e40f44e906..0000000000
--- a/packages/svelte/tests/validator/samples/binding-invalid-foreign-namespace/input.svelte
+++ /dev/null
@@ -1,6 +0,0 @@
-<svelte:options namespace="foreign" />
-<script>
-	let whatever;
-</script>
-
-<input bind:value={whatever} />
diff --git a/packages/svelte/tests/validator/samples/namespace-invalid/errors.json b/packages/svelte/tests/validator/samples/namespace-invalid/errors.json
index bcd2dc1d9c..709c0c2a74 100644
--- a/packages/svelte/tests/validator/samples/namespace-invalid/errors.json
+++ b/packages/svelte/tests/validator/samples/namespace-invalid/errors.json
@@ -1,7 +1,7 @@
 [
 	{
 		"code": "svelte_options_invalid_attribute_value",
-		"message": "Value must be \"html\", \"mathml\", \"svg\" or \"foreign\", if specified",
+		"message": "Value must be \"html\", \"mathml\" or \"svg\", if specified",
 		"start": {
 			"line": 1,
 			"column": 16
diff --git a/packages/svelte/tests/validator/samples/namespace-non-literal/errors.json b/packages/svelte/tests/validator/samples/namespace-non-literal/errors.json
index d7d637fbb1..930e29afb4 100644
--- a/packages/svelte/tests/validator/samples/namespace-non-literal/errors.json
+++ b/packages/svelte/tests/validator/samples/namespace-non-literal/errors.json
@@ -1,7 +1,7 @@
 [
 	{
 		"code": "svelte_options_invalid_attribute_value",
-		"message": "Value must be \"html\", \"mathml\", \"svg\" or \"foreign\", if specified",
+		"message": "Value must be \"html\", \"mathml\" or \"svg\", if specified",
 		"start": {
 			"line": 1,
 			"column": 16
diff --git a/packages/svelte/tests/validator/test.ts b/packages/svelte/tests/validator/test.ts
index 8da4fdd7c3..f419c6360d 100644
--- a/packages/svelte/tests/validator/test.ts
+++ b/packages/svelte/tests/validator/test.ts
@@ -128,21 +128,5 @@ it('errors if namespace is provided but unrecognised', () => {
 			// @ts-expect-error
 			namespace: 'svefefe'
 		});
-	}, /namespace should be one of "html", "svg" or "foreign"/);
-});
-
-it("does not throw error if 'this' is bound for foreign element", () => {
-	assert.doesNotThrow(() => {
-		compile(
-			`
-		<script>
-			let whatever;
-		</script>
-		<div bind:this={whatever}></div>`,
-			{
-				name: 'test',
-				namespace: 'foreign'
-			}
-		);
-	});
+	}, /namespace should be one of "html", "mathml" or "svg"/);
 });
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index 0895821a66..b7412c46e5 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -765,7 +765,7 @@ declare module 'svelte/compiler' {
 		 */
 		accessors?: boolean;
 		/**
-		 * The namespace of the element; e.g., `"html"`, `"svg"`, `"foreign"`.
+		 * The namespace of the element; e.g., `"html"`, `"svg"`, `"mathml"`.
 		 *
 		 * @default 'html'
 		 */
@@ -1504,11 +1504,8 @@ declare module 'svelte/compiler' {
 	 * - `html`    — the default, for e.g. `<div>` or `<span>`
 	 * - `svg`     — for e.g. `<svg>` or `<g>`
 	 * - `mathml`  — for e.g. `<math>` or `<mrow>`
-	 * - `foreign` — for other compilation targets than the web, e.g. Svelte Native.
-	 *               Disallows bindings other than bind:this, disables a11y checks, disables any special attribute handling
-	 *               (also see https://github.com/sveltejs/svelte/pull/5652)
 	 */
-	type Namespace = 'html' | 'svg' | 'mathml' | 'foreign';
+	type Namespace = 'html' | 'svg' | 'mathml';
 
 	interface Root extends BaseNode {
 		type: 'Root';
@@ -2641,7 +2638,7 @@ declare module 'svelte/types/compiler/interfaces' {
 		 */
 		accessors?: boolean;
 		/**
-		 * The namespace of the element; e.g., `"html"`, `"svg"`, `"foreign"`.
+		 * The namespace of the element; e.g., `"html"`, `"svg"`, `"mathml"`.
 		 *
 		 * @default 'html'
 		 */
@@ -2776,11 +2773,8 @@ declare module 'svelte/types/compiler/interfaces' {
 	 * - `html`    — the default, for e.g. `<div>` or `<span>`
 	 * - `svg`     — for e.g. `<svg>` or `<g>`
 	 * - `mathml`  — for e.g. `<math>` or `<mrow>`
-	 * - `foreign` — for other compilation targets than the web, e.g. Svelte Native.
-	 *               Disallows bindings other than bind:this, disables a11y checks, disables any special attribute handling
-	 *               (also see https://github.com/sveltejs/svelte/pull/5652)
 	 */
-	type Namespace = 'html' | 'svg' | 'mathml' | 'foreign';
+	type Namespace = 'html' | 'svg' | 'mathml';
 	type ICompileDiagnostic = {
 		code: string;
 		message: string;