diff --git a/.changeset/itchy-beans-melt.md b/.changeset/itchy-beans-melt.md
new file mode 100644
index 0000000000..e6a58d02ff
--- /dev/null
+++ b/.changeset/itchy-beans-melt.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: fix compiler errors test suite
diff --git a/.changeset/sweet-mangos-beg.md b/.changeset/sweet-mangos-beg.md
new file mode 100644
index 0000000000..3a0adfc03c
--- /dev/null
+++ b/.changeset/sweet-mangos-beg.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: handle css nth-selector syntax
diff --git a/packages/svelte/src/compiler/errors.js b/packages/svelte/src/compiler/errors.js
index 2a2d969475..8d01f4ac97 100644
--- a/packages/svelte/src/compiler/errors.js
+++ b/packages/svelte/src/compiler/errors.js
@@ -24,9 +24,11 @@ const internal = {
 const parse = {
 	/** @param {string} name */
 	'unclosed-element': (name) => `<${name}> was left open`,
-	'unclosed-block': () => `block was left open`,
+	'unclosed-block': () => `Block was left open`,
 	'unexpected-block-close': () => `Unexpected block closing tag`,
-	'unexpected-eof': () => `Unexpected end of input`,
+	/** @param {string} [expected]  */
+	'unexpected-eof': (expected) =>
+		`Unexpected end of input` + (expected ? ` (expected ${expected})` : ''),
 	/** @param {string} message */
 	'js-parse-error': (message) => message,
 	/** @param {string} token */
@@ -39,17 +41,15 @@ const parse = {
 	'invalid-script-context': () =>
 		`If the context attribute is supplied, its value must be "module"`,
 	'invalid-elseif': () => `'elseif' should be 'else if'`,
-	/**
-	 * @param {string} child
-	 * @param {string} parent
-	 */
-	'invalid-block-parent': (child, parent) =>
-		`Expected to close ${parent} before seeing ${child} block`,
+	'invalid-continuing-block-placement': () =>
+		`{:...} block is invalid at this position (did you forget to close the preceeding element or block?)`,
 	/**
 	 * @param {string} child
 	 * @param {string} parent
 	 */
 	'invalid-block-missing-parent': (child, parent) => `${child} block must be a child of ${parent}`,
+	/** @param {string} name */
+	'duplicate-block-part': (name) => `${name} cannot appear more than once within a block`,
 	'expected-block-type': () => `Expected 'if', 'each', 'await', 'key' or 'snippet'`,
 	'expected-identifier': () => `Expected an identifier`,
 	'invalid-debug': () => `{@debug ...} arguments must be identifiers, not arbitrary expressions`,
@@ -98,12 +98,9 @@ const css = {
 	'invalid-css-empty-declaration': () => `Declaration cannot be empty`,
 	'invalid-css-global-placement': () =>
 		`:global(...) can be at the start or end of a selector sequence, but not in the middle`,
-
 	'invalid-css-global-selector': () => `:global(...) must contain exactly one selector`,
-
 	'invalid-css-global-selector-list': () =>
 		`:global(...) cannot be used to modify a selector, or be modified by another selector`,
-
 	'invalid-css-selector': () => `Invalid selector`,
 	'invalid-css-identifier': () => 'Expected a valid CSS identifier'
 };
diff --git a/packages/svelte/src/compiler/phases/1-parse/index.js b/packages/svelte/src/compiler/phases/1-parse/index.js
index 5199ad5960..6b7642c251 100644
--- a/packages/svelte/src/compiler/phases/1-parse/index.js
+++ b/packages/svelte/src/compiler/phases/1-parse/index.js
@@ -77,8 +77,10 @@ export class Parser {
 			const current = this.current();
 
 			if (current.type === 'RegularElement') {
+				current.end = current.start + 1;
 				error(current, 'unclosed-element', current.name);
 			} else {
+				current.end = current.start + 1;
 				error(current, 'unclosed-block');
 			}
 		}
@@ -145,7 +147,7 @@ export class Parser {
 
 		if (required) {
 			if (this.index === this.template.length) {
-				error(this.index, 'unexpected-eof');
+				error(this.index, 'unexpected-eof', str);
 			} else {
 				error(this.index, 'expected-token', str);
 			}
diff --git a/packages/svelte/src/compiler/phases/1-parse/read/style.js b/packages/svelte/src/compiler/phases/1-parse/read/style.js
index 5197f10329..9f59e8205e 100644
--- a/packages/svelte/src/compiler/phases/1-parse/read/style.js
+++ b/packages/svelte/src/compiler/phases/1-parse/read/style.js
@@ -6,6 +6,7 @@ const REGEX_ATTRIBUTE_FLAGS = /^[a-zA-Z]+/; // only `i` and `s` are valid today,
 const REGEX_COMBINATOR_WHITESPACE = /^\s*(\+|~|>|\|\|)\s*/;
 const REGEX_COMBINATOR = /^(\+|~|>|\|\|)/;
 const REGEX_PERCENTAGE = /^\d+(\.\d+)?%/;
+const REGEX_NTH_OF = /^(even|odd|(-?[0-9]?n?(\s*\+\s*[0-9]+)?))(\s+of\s+)?/;
 const REGEX_WHITESPACE_OR_COLON = /[\s:]/;
 const REGEX_BRACE_OR_SEMICOLON = /[{;]/;
 const REGEX_LEADING_HYPHEN_OR_DIGIT = /-?\d/;
@@ -234,6 +235,8 @@ function read_selector(parser, inside_pseudo_class = false) {
 			if (parser.eat('(')) {
 				args = read_selector_list(parser, true);
 				parser.eat(')', true);
+			} else if (name === 'global') {
+				error(parser.index, 'invalid-css-global-selector');
 			}
 
 			children.push({
@@ -291,6 +294,13 @@ function read_selector(parser, inside_pseudo_class = false) {
 				start,
 				end: parser.index
 			});
+		} else if (parser.match_regex(REGEX_NTH_OF)) {
+			children.push({
+				type: 'Nth',
+				value: /** @type {string} */ (parser.read(REGEX_NTH_OF)),
+				start,
+				end: parser.index
+			});
 		} else {
 			let name = read_identifier(parser);
 			if (parser.match('|')) {
diff --git a/packages/svelte/src/compiler/phases/1-parse/state/element.js b/packages/svelte/src/compiler/phases/1-parse/state/element.js
index a5e2a2a82a..019e29c944 100644
--- a/packages/svelte/src/compiler/phases/1-parse/state/element.js
+++ b/packages/svelte/src/compiler/phases/1-parse/state/element.js
@@ -202,11 +202,13 @@ export default function tag(parser) {
 
 	let attribute;
 	while ((attribute = read(parser))) {
-		if (
-			(attribute.type === 'Attribute' || attribute.type === 'BindDirective') &&
-			unique_names.includes(attribute.name)
-		) {
-			error(attribute.start, 'duplicate-attribute');
+		if (attribute.type === 'Attribute' || attribute.type === 'BindDirective') {
+			if (unique_names.includes(attribute.name)) {
+				error(attribute.start, 'duplicate-attribute');
+				// <svelte:element bind:this this=..> is allowed
+			} else if (attribute.name !== 'this') {
+				unique_names.push(attribute.name);
+			}
 		}
 
 		element.attributes.push(attribute);
@@ -635,13 +637,14 @@ function read_attribute_value(parser) {
 			'in attribute value'
 		);
 	} catch (/** @type {any} e */ e) {
-		if (e.code === 'parse-error') {
+		if (e.code === 'js-parse-error') {
 			// if the attribute value didn't close + self-closing tag
 			// eg: `<Component test={{a:1} />`
 			// acorn may throw a `Unterminated regular expression` because of `/>`
-			if (parser.template.slice(e.pos - 1, e.pos + 1) === '/>') {
-				parser.index = e.pos;
-				error(e.pos, 'unclosed-attribute-value', quote_mark || '}');
+			const pos = e.position?.[0];
+			if (pos !== undefined && parser.template.slice(pos - 1, pos + 1) === '/>') {
+				parser.index = pos;
+				error(pos, 'unclosed-attribute-value', quote_mark || '}');
 			}
 		}
 		throw e;
diff --git a/packages/svelte/src/compiler/phases/1-parse/state/tag.js b/packages/svelte/src/compiler/phases/1-parse/state/tag.js
index 36a66ac59f..ebfebb73b1 100644
--- a/packages/svelte/src/compiler/phases/1-parse/state/tag.js
+++ b/packages/svelte/src/compiler/phases/1-parse/state/tag.js
@@ -315,7 +315,7 @@ function next(parser) {
 	const block = parser.current(); // TODO type should not be TemplateNode, that's much too broad
 
 	if (block.type === 'IfBlock') {
-		if (!parser.eat('else')) error(start, 'expected-token', 'else');
+		if (!parser.eat('else')) error(start, 'expected-token', '{:else} or {:else if}');
 		if (parser.eat('if')) error(start, 'invalid-elseif');
 
 		parser.allow_whitespace();
@@ -359,7 +359,7 @@ function next(parser) {
 	}
 
 	if (block.type === 'EachBlock') {
-		if (!parser.eat('else')) error(start, 'expected-token', 'else');
+		if (!parser.eat('else')) error(start, 'expected-token', '{:else}');
 
 		parser.allow_whitespace();
 		parser.eat('}', true);
@@ -375,7 +375,7 @@ function next(parser) {
 	if (block.type === 'AwaitBlock') {
 		if (parser.eat('then')) {
 			if (block.then) {
-				error(start, 'TODO', 'duplicate then');
+				error(start, 'duplicate-block-part', '{:then}');
 			}
 
 			if (!parser.eat('}')) {
@@ -394,7 +394,7 @@ function next(parser) {
 
 		if (parser.eat('catch')) {
 			if (block.catch) {
-				error(start, 'TODO', 'duplicate catch');
+				error(start, 'duplicate-block-part', '{:catch}');
 			}
 
 			if (!parser.eat('}')) {
@@ -413,6 +413,8 @@ function next(parser) {
 
 		error(start, 'expected-token', '{:then ...} or {:catch ...}');
 	}
+
+	error(start, 'invalid-continuing-block-placement');
 }
 
 /** @param {import('../index.js').Parser} parser */
diff --git a/packages/svelte/src/compiler/phases/2-analyze/css/Selector.js b/packages/svelte/src/compiler/phases/2-analyze/css/Selector.js
index fcddaf2df6..b0942d6572 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/css/Selector.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/css/Selector.js
@@ -306,7 +306,7 @@ function block_might_apply_to_node(block, node) {
 	while (i--) {
 		const selector = block.selectors[i];
 
-		if (selector.type === 'Percentage') continue;
+		if (selector.type === 'Percentage' || selector.type === 'Nth') continue;
 
 		const name = selector.name.replace(regex_backslash_and_following_character, '$1');
 
diff --git a/packages/svelte/src/compiler/types/css.d.ts b/packages/svelte/src/compiler/types/css.d.ts
index 7d936207ac..49a3fc5143 100644
--- a/packages/svelte/src/compiler/types/css.d.ts
+++ b/packages/svelte/src/compiler/types/css.d.ts
@@ -67,6 +67,11 @@ export interface Percentage extends BaseNode {
 	value: string;
 }
 
+export interface Nth extends BaseNode {
+	type: 'Nth';
+	value: string;
+}
+
 export type SimpleSelector =
 	| TypeSelector
 	| IdSelector
@@ -74,7 +79,8 @@ export type SimpleSelector =
 	| AttributeSelector
 	| PseudoElementSelector
 	| PseudoClassSelector
-	| Percentage;
+	| Percentage
+	| Nth;
 
 export interface Combinator extends BaseNode {
 	type: 'Combinator';
diff --git a/packages/svelte/tests/compiler-errors/samples/attribute-empty/_config.js b/packages/svelte/tests/compiler-errors/samples/attribute-empty/_config.js
index 5823dca910..248fc1107e 100644
--- a/packages/svelte/tests/compiler-errors/samples/attribute-empty/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/attribute-empty/_config.js
@@ -3,7 +3,7 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'missing-attribute-value',
-		message: 'Expected value for the attribute',
+		message: 'Expected attribute value',
 		position: [12, 12]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/attribute-empty/input.svelte b/packages/svelte/tests/compiler-errors/samples/attribute-empty/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/attribute-empty/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/attribute-empty/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/attribute-unique-binding/input.svelte b/packages/svelte/tests/compiler-errors/samples/attribute-unique-binding/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/attribute-unique-binding/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/attribute-unique-binding/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/attribute-unique-shorthand/input.svelte b/packages/svelte/tests/compiler-errors/samples/attribute-unique-shorthand/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/attribute-unique-shorthand/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/attribute-unique-shorthand/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/attribute-unique/input.svelte b/packages/svelte/tests/compiler-errors/samples/attribute-unique/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/attribute-unique/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/attribute-unique/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/catch-before-closing/_config.js b/packages/svelte/tests/compiler-errors/samples/catch-before-closing/_config.js
index 5fb8c58c2a..1a50076da4 100644
--- a/packages/svelte/tests/compiler-errors/samples/catch-before-closing/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/catch-before-closing/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-catch-placement',
-		message: 'Expected to close {#each} block before seeing {:catch} block',
-		position: [41, 41]
+		code: 'expected-token',
+		message: 'Expected token {:else}',
+		position: [35, 35]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/catch-before-closing/input.svelte b/packages/svelte/tests/compiler-errors/samples/catch-before-closing/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/catch-before-closing/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/catch-before-closing/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/catch-without-await/_config.js b/packages/svelte/tests/compiler-errors/samples/catch-without-await/_config.js
index 63f3b5e3cd..64c85f85c9 100644
--- a/packages/svelte/tests/compiler-errors/samples/catch-without-await/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/catch-without-await/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-catch-placement',
-		message: 'Cannot have an {:catch} block outside an {#await ...} block',
-		position: [7, 7]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [1, 1]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/catch-without-await/input.svelte b/packages/svelte/tests/compiler-errors/samples/catch-without-await/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/catch-without-await/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/catch-without-await/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/class-state-field-static/_config.js b/packages/svelte/tests/compiler-errors/samples/class-state-field-static/_config.js
index b6dca4e40d..27991ba427 100644
--- a/packages/svelte/tests/compiler-errors/samples/class-state-field-static/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/class-state-field-static/_config.js
@@ -4,6 +4,6 @@ export default test({
 	error: {
 		code: 'invalid-state-location',
 		message: '$state() can only be used as a variable declaration initializer or a class field',
-		position: process.platform === 'win32' ? [35, 43] : [33, 41]
+		position: [33, 41]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/comment-unclosed/_config.js b/packages/svelte/tests/compiler-errors/samples/comment-unclosed/_config.js
index 166a9df9b7..7c00375ad6 100644
--- a/packages/svelte/tests/compiler-errors/samples/comment-unclosed/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/comment-unclosed/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'unclosed-comment',
-		message: 'comment was left open, expected -->',
+		code: 'unexpected-eof',
+		message: 'Unexpected end of input (expected -->)',
 		position: [24, 24]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/comment-unclosed/input.svelte b/packages/svelte/tests/compiler-errors/samples/comment-unclosed/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/comment-unclosed/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/comment-unclosed/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/_config.js b/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/_config.js
index c8e598d4a8..549ad3ebe2 100644
--- a/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'css-syntax-error',
-		message: ':global() must contain a selector',
-		position: [9, 9]
+		code: 'invalid-css-global-selector',
+		message: ':global(...) must contain exactly one selector',
+		position: [16, 16]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/input.svelte b/packages/svelte/tests/compiler-errors/samples/css-global-without-selector/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/css-global-without-selector/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/css-global-without-selector/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/css/_config.js b/packages/svelte/tests/compiler-errors/samples/css/_config.js
index d1a7e346f9..9705cde6b5 100644
--- a/packages/svelte/tests/compiler-errors/samples/css/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/css/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'css-syntax-error',
-		message: '"{" is expected',
-		position: [24, 24]
+		code: 'invalid-css-identifier',
+		message: 'Expected a valid CSS identifier',
+		position: [25, 25]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/css/input.svelte b/packages/svelte/tests/compiler-errors/samples/css/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/css/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/css/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/dollar-binding-global-js/main.js b/packages/svelte/tests/compiler-errors/samples/dollar-binding-global-js/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/dollar-binding-global-js/main.js
rename to packages/svelte/tests/compiler-errors/samples/dollar-binding-global-js/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/_config.js b/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/_config.js
index 7b1d43bf1d..dc9aff145c 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-else-placement',
-		message: 'Expected to close {#await} block before seeing {:else} block',
-		position: [29, 29]
+		code: 'expected-token',
+		message: 'Expected token {:then ...} or {:catch ...}',
+		position: [24, 24]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-before-closing-2/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-before-closing-2/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-before-closing-2/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/_config.js b/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/_config.js
index ab7281cee5..80a2a136db 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-else-placement',
-		message: 'Cannot have an {:else} block outside an {#if ...} or {#each ...} block',
-		position: [11, 11]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [6, 6]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-before-closing-3/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-before-closing-3/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-before-closing-3/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing/_config.js b/packages/svelte/tests/compiler-errors/samples/else-before-closing/_config.js
index 31635f2124..87c1296f49 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-before-closing/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-before-closing/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-else-placement',
-		message: 'Expected to close <li> tag before seeing {:else} block',
-		position: [23, 23]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [18, 18]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-before-closing/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-before-closing/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-before-closing/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-before-closing/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/_config.js b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/_config.js
index 10ed037ede..4b4059cf3b 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-elseif-placement',
-		message: 'Expected to close <p> tag before seeing {:else if ...} block',
-		position: [25, 25]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [17, 17]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-if-before-closing-2/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/_config.js b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/_config.js
index 70823c9959..ae20d2da8c 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-elseif-placement',
-		message: 'Expected to close {#await} block before seeing {:else if ...} block',
-		position: [34, 34]
+		code: 'expected-token',
+		message: 'Expected token {:then ...} or {:catch ...}',
+		position: [26, 26]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-if-before-closing/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-if-before-closing/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-if-before-closing/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-without-if/_config.js b/packages/svelte/tests/compiler-errors/samples/else-if-without-if/_config.js
index cb8e35c41d..04d8342f20 100644
--- a/packages/svelte/tests/compiler-errors/samples/else-if-without-if/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/else-if-without-if/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-elseif-placement',
-		message: 'Cannot have an {:else if ...} block outside an {#if ...} block',
-		position: [35, 35]
+		code: 'expected-token',
+		message: 'Expected token {:then ...} or {:catch ...}',
+		position: [27, 27]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/else-if-without-if/input.svelte b/packages/svelte/tests/compiler-errors/samples/else-if-without-if/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/else-if-without-if/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/else-if-without-if/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/empty-attribute-shorthand/input.svelte b/packages/svelte/tests/compiler-errors/samples/empty-attribute-shorthand/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/empty-attribute-shorthand/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/empty-attribute-shorthand/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/_config.js b/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/_config.js
index 0051e827a5..bd1d1d7682 100644
--- a/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/_config.js
@@ -3,7 +3,7 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'empty-directive-name',
-		message: 'Class name cannot be empty',
+		message: 'ClassDirective name cannot be empty',
 		position: [10, 10]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/input.svelte b/packages/svelte/tests/compiler-errors/samples/empty-classname-binding/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/empty-classname-binding/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/empty-classname-binding/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/empty-directive-name/_config.js b/packages/svelte/tests/compiler-errors/samples/empty-directive-name/_config.js
index 7f6d0f1d0f..48a0eb32c4 100644
--- a/packages/svelte/tests/compiler-errors/samples/empty-directive-name/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/empty-directive-name/_config.js
@@ -3,7 +3,7 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'empty-directive-name',
-		message: 'Action name cannot be empty',
+		message: 'UseDirective name cannot be empty',
 		position: [8, 8]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/empty-directive-name/input.svelte b/packages/svelte/tests/compiler-errors/samples/empty-directive-name/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/empty-directive-name/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/empty-directive-name/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/export-derived-state/_config.js b/packages/svelte/tests/compiler-errors/samples/export-derived-state/_config.js
index 801d1d8a30..1c171d19c0 100644
--- a/packages/svelte/tests/compiler-errors/samples/export-derived-state/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/export-derived-state/_config.js
@@ -4,6 +4,6 @@ export default test({
 	error: {
 		code: 'invalid-derived-export',
 		message: 'Cannot export derived state',
-		position: process.platform === 'win32' ? [26, 68] : [24, 66]
+		position: [24, 66]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/export-state/_config.js b/packages/svelte/tests/compiler-errors/samples/export-state/_config.js
index 755b891586..5ddb2a859a 100644
--- a/packages/svelte/tests/compiler-errors/samples/export-state/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/export-state/_config.js
@@ -4,6 +4,6 @@ export default test({
 	error: {
 		code: 'invalid-state-export',
 		message: 'Cannot export state if it is reassigned',
-		position: process.platform === 'win32' ? [50, 90] : [46, 86]
+		position: [46, 86]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/illegal-expression/_config.js b/packages/svelte/tests/compiler-errors/samples/illegal-expression/_config.js
index 659679c345..887f11e882 100644
--- a/packages/svelte/tests/compiler-errors/samples/illegal-expression/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/illegal-expression/_config.js
@@ -2,7 +2,7 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'parse-error',
+		code: 'js-parse-error',
 		message: 'Assigning to rvalue',
 		position: [1, 1]
 	}
diff --git a/packages/svelte/tests/compiler-errors/samples/illegal-expression/input.svelte b/packages/svelte/tests/compiler-errors/samples/illegal-expression/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/illegal-expression/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/illegal-expression/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/multiple-styles/_config.js b/packages/svelte/tests/compiler-errors/samples/multiple-styles/_config.js
index da3e69fc1e..50cf2583af 100644
--- a/packages/svelte/tests/compiler-errors/samples/multiple-styles/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/multiple-styles/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'duplicate-style',
-		message: 'You can only have one top-level <style> tag per component',
+		code: 'duplicate-style-element',
+		message: 'A component can have a single top-level <style> element',
 		position: [58, 58]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/multiple-styles/input.svelte b/packages/svelte/tests/compiler-errors/samples/multiple-styles/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/multiple-styles/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/multiple-styles/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/raw-mustaches-whitespace/input.svelte b/packages/svelte/tests/compiler-errors/samples/raw-mustaches-whitespace/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/raw-mustaches-whitespace/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/raw-mustaches-whitespace/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/_config.js b/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/_config.js
index effac3060d..a42a651141 100644
--- a/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/_config.js
@@ -2,7 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: '',
-		message: 'Cannot export value created with $state'
+		code: 'invalid-state-export',
+		message: 'Cannot export state if it is reassigned',
+		position: [28, 53]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.js b/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.js
deleted file mode 100644
index 714838f27a..0000000000
--- a/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.js
+++ /dev/null
@@ -1 +0,0 @@
-export const x = $state(0);
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.svelte.js b/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.svelte.js
new file mode 100644
index 0000000000..af62861e67
--- /dev/null
+++ b/packages/svelte/tests/compiler-errors/samples/runes-export-named-state/main.svelte.js
@@ -0,0 +1,3 @@
+export const x = $state(0);
+export let y = $state(0);
+y = 1;
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-no-const-assignment/main.js b/packages/svelte/tests/compiler-errors/samples/runes-no-const-assignment/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-no-const-assignment/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-no-const-assignment/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-args/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-args/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-args/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-args/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-placement/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-placement/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-placement/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-derived-placement/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-args/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-args/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-args/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-args/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-placement/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-placement/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-placement/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-effect-placement/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-props-placement/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-props-placement/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-props-placement/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-props-placement/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-state-args/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-state-args/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-state-args/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-state-args/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/runes-wrong-state-placement/main.js b/packages/svelte/tests/compiler-errors/samples/runes-wrong-state-placement/main.svelte.js
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/runes-wrong-state-placement/main.js
rename to packages/svelte/tests/compiler-errors/samples/runes-wrong-state-placement/main.svelte.js
diff --git a/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/_config.js b/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/_config.js
index 0e41735d00..c8b496e41e 100644
--- a/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'unclosed-script',
-		message: '<script> must have a closing tag',
+		code: 'unexpected-eof',
+		message: 'Unexpected end of input',
 		position: [32, 32]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/script-unclosed/input.svelte b/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/script-unclosed/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/script-unclosed/_config.js b/packages/svelte/tests/compiler-errors/samples/script-unclosed/_config.js
index 0e41735d00..30c59d6f28 100644
--- a/packages/svelte/tests/compiler-errors/samples/script-unclosed/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/script-unclosed/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'unclosed-script',
-		message: '<script> must have a closing tag',
+		code: 'unclosed-element',
+		message: '<script> was left open',
 		position: [32, 32]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/input.svelte b/packages/svelte/tests/compiler-errors/samples/script-unclosed/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/script-unclosed-eof/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/script-unclosed/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/self-reference/_config.js b/packages/svelte/tests/compiler-errors/samples/self-reference/_config.js
index 5f5980b7ed..8148e18332 100644
--- a/packages/svelte/tests/compiler-errors/samples/self-reference/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/self-reference/_config.js
@@ -4,7 +4,7 @@ export default test({
 	error: {
 		code: 'invalid-self-placement',
 		message:
-			'<svelte:self> components can only exist inside {#if} blocks, {#each} blocks,, {#snippet} blocks or slots passed to components',
+			'<svelte:self> components can only exist inside {#if} blocks, {#each} blocks, {#snippet} blocks or slots passed to components',
 		position: [1, 1]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/self-reference/input.svelte b/packages/svelte/tests/compiler-errors/samples/self-reference/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/self-reference/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/self-reference/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/_config.js b/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/_config.js
index 12b200322a..8d27a7297d 100644
--- a/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'unclosed-style',
-		message: '<style> must have a closing tag',
+		code: 'expected-token',
+		message: 'Expected token </style',
 		position: [31, 31]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/style-unclosed/input.svelte b/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/style-unclosed/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/style-unclosed/_config.js b/packages/svelte/tests/compiler-errors/samples/style-unclosed/_config.js
index 12b200322a..602f196039 100644
--- a/packages/svelte/tests/compiler-errors/samples/style-unclosed/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/style-unclosed/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'unclosed-style',
-		message: '<style> must have a closing tag',
-		position: [31, 31]
+		code: 'invalid-css-identifier',
+		message: 'Expected a valid CSS identifier',
+		position: [9, 9]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/input.svelte b/packages/svelte/tests/compiler-errors/samples/style-unclosed/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/style-unclosed-eof/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/style-unclosed/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/_config.js b/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/_config.js
index d102c9f4ac..b88609ffe9 100644
--- a/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/_config.js
@@ -2,9 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-tag-name',
+		code: 'invalid-svelte-tag',
 		message:
-			'Valid <svelte:...> tag names are svelte:head, svelte:options, svelte:window, svelte:document, svelte:body, svelte:self, svelte:component, svelte:fragment or svelte:element',
+			'Valid <svelte:...> tag names are svelte:head, svelte:options, svelte:window, svelte:document, svelte:body, svelte:element, svelte:component, svelte:self or svelte:fragment',
 		position: [10, 10]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/input.svelte b/packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/svelte-selfdestructive/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/then-before-closing/_config.js b/packages/svelte/tests/compiler-errors/samples/then-before-closing/_config.js
index cd5dc42132..7c1ea02cc1 100644
--- a/packages/svelte/tests/compiler-errors/samples/then-before-closing/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/then-before-closing/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-then-placement',
-		message: 'Expected to close <li> tag before seeing {:then} block',
-		position: [26, 26]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [21, 21]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/then-before-closing/input.svelte b/packages/svelte/tests/compiler-errors/samples/then-before-closing/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/then-before-closing/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/then-before-closing/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/then-without-await/_config.js b/packages/svelte/tests/compiler-errors/samples/then-without-await/_config.js
index 36f9cd92e2..64c85f85c9 100644
--- a/packages/svelte/tests/compiler-errors/samples/then-without-await/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/then-without-await/_config.js
@@ -2,8 +2,9 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-then-placement',
-		message: 'Cannot have an {:then} block outside an {#await ...} block',
-		position: [6, 6]
+		code: 'invalid-continuing-block-placement',
+		message:
+			'{:...} block is invalid at this position (did you forget to close the preceeding element or block?)',
+		position: [1, 1]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/then-without-await/input.svelte b/packages/svelte/tests/compiler-errors/samples/then-without-await/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/then-without-await/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/then-without-await/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/_config.js b/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/_config.js
index a11d5d3654..2f4ec8835f 100644
--- a/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/_config.js
@@ -3,7 +3,7 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'unclosed-attribute-value',
-		message: 'Expected to close the attribute value with }',
-		position: [25, 25]
+		message: 'Expected closing } character',
+		position: [19, 19]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/input.svelte b/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/input.svelte
deleted file mode 100644
index 609b5532f4..0000000000
--- a/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/input.svelte
+++ /dev/null
@@ -1 +0,0 @@
-<Component test={{a: 1} />
\ No newline at end of file
diff --git a/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/main.svelte b/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/main.svelte
new file mode 100644
index 0000000000..3166782f6f
--- /dev/null
+++ b/packages/svelte/tests/compiler-errors/samples/unclosed-attribute-self-close-tag/main.svelte
@@ -0,0 +1 @@
+<Component test={ />
\ No newline at end of file
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-b/input.svelte b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-b/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-b/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-b/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-c/input.svelte b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-c/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-c/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-c/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/_config.js b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/_config.js
index 44a3558a54..b10de772d3 100644
--- a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/_config.js
@@ -4,6 +4,6 @@ export default test({
 	error: {
 		code: 'unclosed-block',
 		message: 'Block was left open',
-		position: [0, 0]
+		position: [0, 1]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/input.svelte b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input-d/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/_config.js b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/_config.js
index 3b7864cad5..8ff85b7243 100644
--- a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/_config.js
@@ -4,6 +4,6 @@ export default test({
 	error: {
 		code: 'unclosed-element',
 		message: '<div> was left open',
-		position: [0, 0]
+		position: [0, 1]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/input.svelte b/packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unexpected-end-of-input/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose-2/input.svelte b/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose-2/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose-2/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose-2/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/_config.js b/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/_config.js
index 341a468311..b485095bc0 100644
--- a/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-closing-tag',
-		message: '</p> attempted to close <p> that was already automatically closed by <pre>',
+		code: 'invalid-closing-tag-after-autoclose',
+		message: '</p> attempted to close element that was already automatically closed by <pre>',
 		position: [24, 24]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/input.svelte b/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag-autoclose/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag/input.svelte b/packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/unmatched-closing-tag/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/void-closing/_config.js b/packages/svelte/tests/compiler-errors/samples/void-closing/_config.js
index 2c9f9fad2d..704d8c6029 100644
--- a/packages/svelte/tests/compiler-errors/samples/void-closing/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/void-closing/_config.js
@@ -3,7 +3,7 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'invalid-void-content',
-		message: '<input> is a void element and cannot have children, or a closing tag',
+		message: 'Void elements cannot have children or closing tags',
 		position: [23, 23]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/void-closing/input.svelte b/packages/svelte/tests/compiler-errors/samples/void-closing/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/void-closing/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/void-closing/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/window-children/_config.js b/packages/svelte/tests/compiler-errors/samples/window-children/_config.js
index 794381c939..33b57bf5f6 100644
--- a/packages/svelte/tests/compiler-errors/samples/window-children/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/window-children/_config.js
@@ -2,7 +2,7 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-window-content',
+		code: 'invalid-element-content',
 		message: '<svelte:window> cannot have children',
 		position: [15, 15]
 	}
diff --git a/packages/svelte/tests/compiler-errors/samples/window-children/input.svelte b/packages/svelte/tests/compiler-errors/samples/window-children/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/window-children/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/window-children/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/window-duplicate/_config.js b/packages/svelte/tests/compiler-errors/samples/window-duplicate/_config.js
index 3eff2d3e9f..9c068c0297 100644
--- a/packages/svelte/tests/compiler-errors/samples/window-duplicate/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/window-duplicate/_config.js
@@ -2,8 +2,8 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'duplicate-window',
-		message: 'A component can only have one <svelte:window> tag',
+		code: 'duplicate-svelte-element',
+		message: 'A component can only have one <svelte:window> element',
 		position: [17, 17]
 	}
 });
diff --git a/packages/svelte/tests/compiler-errors/samples/window-duplicate/input.svelte b/packages/svelte/tests/compiler-errors/samples/window-duplicate/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/window-duplicate/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/window-duplicate/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/window-inside-block/_config.js b/packages/svelte/tests/compiler-errors/samples/window-inside-block/_config.js
index f47b6be7eb..698c3813e6 100644
--- a/packages/svelte/tests/compiler-errors/samples/window-inside-block/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/window-inside-block/_config.js
@@ -2,7 +2,7 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-window-placement',
+		code: 'invalid-svelte-element-placement',
 		message: '<svelte:window> tags cannot be inside elements or blocks',
 		position: [11, 11]
 	}
diff --git a/packages/svelte/tests/compiler-errors/samples/window-inside-block/input.svelte b/packages/svelte/tests/compiler-errors/samples/window-inside-block/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/window-inside-block/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/window-inside-block/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/samples/window-inside-element/_config.js b/packages/svelte/tests/compiler-errors/samples/window-inside-element/_config.js
index e4411b8df0..04aba56e54 100644
--- a/packages/svelte/tests/compiler-errors/samples/window-inside-element/_config.js
+++ b/packages/svelte/tests/compiler-errors/samples/window-inside-element/_config.js
@@ -2,7 +2,7 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-window-placement',
+		code: 'invalid-svelte-element-placement',
 		message: '<svelte:window> tags cannot be inside elements or blocks',
 		position: [7, 7]
 	}
diff --git a/packages/svelte/tests/compiler-errors/samples/window-inside-element/input.svelte b/packages/svelte/tests/compiler-errors/samples/window-inside-element/main.svelte
similarity index 100%
rename from packages/svelte/tests/compiler-errors/samples/window-inside-element/input.svelte
rename to packages/svelte/tests/compiler-errors/samples/window-inside-element/main.svelte
diff --git a/packages/svelte/tests/compiler-errors/test.ts b/packages/svelte/tests/compiler-errors/test.ts
index 376e790db6..ea696890b4 100644
--- a/packages/svelte/tests/compiler-errors/test.ts
+++ b/packages/svelte/tests/compiler-errors/test.ts
@@ -2,6 +2,7 @@ import * as fs from 'node:fs';
 import { assert, expect } from 'vitest';
 import { compile, compileModule, type CompileError } from 'svelte/compiler';
 import { suite, type BaseTest } from '../suite';
+import { read_file } from '../helpers.js';
 
 interface CompilerErrorTest extends BaseTest {
 	error: {
@@ -12,11 +13,15 @@ interface CompilerErrorTest extends BaseTest {
 }
 
 const { test, run } = suite<CompilerErrorTest>((config, cwd) => {
+	if (!fs.existsSync(`${cwd}/main.svelte`) && !fs.existsSync(`${cwd}/main.svelte.js`)) {
+		throw new Error('Expected main.svelte or main.svelte.js');
+	}
+
 	if (fs.existsSync(`${cwd}/main.svelte`)) {
 		let caught_error = false;
 
 		try {
-			compile(fs.readFileSync(`${cwd}/main.svelte`, 'utf-8'), {
+			compile(read_file(`${cwd}/main.svelte`), {
 				generate: 'client'
 			});
 		} catch (e) {
@@ -41,7 +46,7 @@ const { test, run } = suite<CompilerErrorTest>((config, cwd) => {
 		let caught_error = false;
 
 		try {
-			compileModule(fs.readFileSync(`${cwd}/main.svelte.js`, 'utf-8'), {
+			compileModule(read_file(`${cwd}/main.svelte.js`), {
 				generate: 'client'
 			});
 		} catch (e) {
@@ -49,8 +54,8 @@ const { test, run } = suite<CompilerErrorTest>((config, cwd) => {
 
 			caught_error = true;
 
-			expect(error.code).toMatch(config.error.code);
-			expect(error.message).toMatch(config.error.message);
+			expect(error.code).toEqual(config.error.code);
+			expect(error.message).toEqual(config.error.message);
 
 			if (config.error.position) {
 				expect(error.position).toEqual(config.error.position);
diff --git a/packages/svelte/tests/helpers.js b/packages/svelte/tests/helpers.js
index 46f70b011b..a8e3d605d9 100644
--- a/packages/svelte/tests/helpers.js
+++ b/packages/svelte/tests/helpers.js
@@ -20,13 +20,20 @@ export function try_load_json(file) {
  */
 export function try_read_file(file) {
 	try {
-		return fs.readFileSync(file, 'utf-8').replace(/\r\n/g, '\n');
+		return read_file(file);
 	} catch (err) {
 		if (/** @type {any} */ (err).code !== 'ENOENT') throw err;
 		return null;
 	}
 }
 
+/**
+ * @param {string} file
+ */
+export function read_file(file) {
+	return fs.readFileSync(file, 'utf-8').replace(/\r\n/g, '\n');
+}
+
 export function create_deferred() {
 	/** @param {any} [value] */
 	let resolve = (value) => {};
diff --git a/packages/svelte/tests/parser-modern/samples/css-nth-syntax/input.svelte b/packages/svelte/tests/parser-modern/samples/css-nth-syntax/input.svelte
new file mode 100644
index 0000000000..b8e2d40864
--- /dev/null
+++ b/packages/svelte/tests/parser-modern/samples/css-nth-syntax/input.svelte
@@ -0,0 +1,26 @@
+<style>
+    /* test that all these are parsed correctly */
+	h1:nth-of-type(2n+1){
+        background: red;
+    }
+    h1:nth-child(-n + 3 of li.important) {
+        background: red;
+    }
+    h1:nth-child(1) {
+        background: red;
+    }
+    h1:nth-child(p) {
+        background: red;
+    }
+    h1:nth-child(n+7) {
+        background: red;
+    }
+    h1:nth-child(even) {
+        background: red;
+    }
+    h1:nth-child(odd) {
+        background: red;
+    }
+</style>
+
+<h1>Broken</h1>
diff --git a/packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json b/packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json
new file mode 100644
index 0000000000..1cea48b17c
--- /dev/null
+++ b/packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json
@@ -0,0 +1,520 @@
+{
+	"css": {
+		"type": "Style",
+		"start": 0,
+		"end": 467,
+		"attributes": [],
+		"children": [
+			{
+				"type": "Rule",
+				"prelude": {
+					"type": "SelectorList",
+					"start": 60,
+					"end": 80,
+					"children": [
+						{
+							"type": "Selector",
+							"start": 60,
+							"end": 80,
+							"children": [
+								{
+									"type": "TypeSelector",
+									"name": "h1",
+									"start": 60,
+									"end": 62
+								},
+								{
+									"type": "PseudoClassSelector",
+									"name": "nth-of-type",
+									"args": {
+										"type": "SelectorList",
+										"start": 75,
+										"end": 79,
+										"children": [
+											{
+												"type": "Selector",
+												"start": 75,
+												"end": 79,
+												"children": [
+													{
+														"type": "Nth",
+														"value": "2n+1",
+														"start": 75,
+														"end": 79
+													}
+												]
+											}
+										]
+									},
+									"start": 62,
+									"end": 80
+								}
+							]
+						}
+					]
+				},
+				"block": {
+					"type": "Block",
+					"start": 80,
+					"end": 112,
+					"children": [
+						{
+							"type": "Declaration",
+							"start": 90,
+							"end": 105,
+							"property": "background",
+							"value": "red"
+						}
+					]
+				},
+				"start": 60,
+				"end": 112
+			},
+			{
+				"type": "Rule",
+				"prelude": {
+					"type": "SelectorList",
+					"start": 117,
+					"end": 153,
+					"children": [
+						{
+							"type": "Selector",
+							"start": 117,
+							"end": 153,
+							"children": [
+								{
+									"type": "TypeSelector",
+									"name": "h1",
+									"start": 117,
+									"end": 119
+								},
+								{
+									"type": "PseudoClassSelector",
+									"name": "nth-child",
+									"args": {
+										"type": "SelectorList",
+										"start": 130,
+										"end": 152,
+										"children": [
+											{
+												"type": "Selector",
+												"start": 130,
+												"end": 152,
+												"children": [
+													{
+														"type": "Nth",
+														"value": "-n + 3 of ",
+														"start": 130,
+														"end": 140
+													},
+													{
+														"type": "TypeSelector",
+														"name": "li",
+														"start": 140,
+														"end": 142
+													},
+													{
+														"type": "ClassSelector",
+														"name": "important",
+														"start": 142,
+														"end": 152
+													}
+												]
+											}
+										]
+									},
+									"start": 119,
+									"end": 153
+								}
+							]
+						}
+					]
+				},
+				"block": {
+					"type": "Block",
+					"start": 154,
+					"end": 186,
+					"children": [
+						{
+							"type": "Declaration",
+							"start": 164,
+							"end": 179,
+							"property": "background",
+							"value": "red"
+						}
+					]
+				},
+				"start": 117,
+				"end": 186
+			},
+			{
+				"type": "Rule",
+				"prelude": {
+					"type": "SelectorList",
+					"start": 191,
+					"end": 206,
+					"children": [
+						{
+							"type": "Selector",
+							"start": 191,
+							"end": 206,
+							"children": [
+								{
+									"type": "TypeSelector",
+									"name": "h1",
+									"start": 191,
+									"end": 193
+								},
+								{
+									"type": "PseudoClassSelector",
+									"name": "nth-child",
+									"args": {
+										"type": "SelectorList",
+										"start": 204,
+										"end": 205,
+										"children": [
+											{
+												"type": "Selector",
+												"start": 204,
+												"end": 205,
+												"children": [
+													{
+														"type": "Nth",
+														"value": "1",
+														"start": 204,
+														"end": 205
+													}
+												]
+											}
+										]
+									},
+									"start": 193,
+									"end": 206
+								}
+							]
+						}
+					]
+				},
+				"block": {
+					"type": "Block",
+					"start": 207,
+					"end": 239,
+					"children": [
+						{
+							"type": "Declaration",
+							"start": 217,
+							"end": 232,
+							"property": "background",
+							"value": "red"
+						}
+					]
+				},
+				"start": 191,
+				"end": 239
+			},
+			{
+				"type": "Rule",
+				"prelude": {
+					"type": "SelectorList",
+					"start": 244,
+					"end": 259,
+					"children": [
+						{
+							"type": "Selector",
+							"start": 244,
+							"end": 259,
+							"children": [
+								{
+									"type": "TypeSelector",
+									"name": "h1",
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+							"property": "background",
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+			},
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+									"end": 410
+								},
+								{
+									"type": "PseudoClassSelector",
+									"name": "nth-child",
+									"args": {
+										"type": "SelectorList",
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+										"end": 424,
+										"children": [
+											{
+												"type": "Selector",
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+												"end": 424,
+												"children": [
+													{
+														"type": "Nth",
+														"value": "odd",
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+														"end": 424
+													}
+												]
+											}
+										]
+									},
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+								}
+							]
+						}
+					]
+				},
+				"block": {
+					"type": "Block",
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+					"end": 458,
+					"children": [
+						{
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+							"end": 451,
+							"property": "background",
+							"value": "red"
+						}
+					]
+				},
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+				"end": 458
+			}
+		],
+		"content": {
+			"start": 7,
+			"end": 459,
+			"styles": "\n    /* test that all these are parsed correctly */\n\th1:nth-of-type(2n+1){\n        background: red;\n    }\n    h1:nth-child(-n + 3 of li.important) {\n        background: red;\n    }\n    h1:nth-child(1) {\n        background: red;\n    }\n    h1:nth-child(p) {\n        background: red;\n    }\n    h1:nth-child(n+7) {\n        background: red;\n    }\n    h1:nth-child(even) {\n        background: red;\n    }\n    h1:nth-child(odd) {\n        background: red;\n    }\n"
+		}
+	},
+	"js": [],
+	"start": 469,
+	"end": 484,
+	"type": "Root",
+	"fragment": {
+		"type": "Fragment",
+		"nodes": [
+			{
+				"type": "Text",
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+				"end": 469,
+				"raw": "\n\n",
+				"data": "\n\n"
+			},
+			{
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+				"end": 484,
+				"name": "h1",
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+					"type": "Fragment",
+					"nodes": [
+						{
+							"type": "Text",
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+							"end": 479,
+							"raw": "Broken",
+							"data": "Broken"
+						}
+					],
+					"transparent": true
+				}
+			}
+		],
+		"transparent": false
+	},
+	"options": null
+}