diff --git a/packages/svelte/src/compiler/legacy.js b/packages/svelte/src/compiler/legacy.js
index 363742e7b1..ea46328185 100644
--- a/packages/svelte/src/compiler/legacy.js
+++ b/packages/svelte/src/compiler/legacy.js
@@ -102,14 +102,7 @@ export function convert(source, ast) {
 					},
 					instance,
 					module,
-					css: ast.css
-						? walk(ast.css, null, {
-								_(node) {
-									// @ts-ignore
-									delete node.parent;
-								}
-							})
-						: undefined
+					css: ast.css ? visit(ast.css) : undefined
 				};
 			},
 			AnimateDirective(node) {
@@ -192,6 +185,24 @@ export function convert(source, ast) {
 			ClassDirective(node) {
 				return { ...node, type: 'Class' };
 			},
+			ComplexSelector(node, { visit }) {
+				const children = [];
+
+				for (const child of node.children) {
+					if (child.combinator) {
+						children.push(child.combinator);
+					}
+
+					children.push(...child.selectors);
+				}
+
+				return {
+					type: 'Selector',
+					start: node.start,
+					end: node.end,
+					children
+				};
+			},
 			Component(node, { visit }) {
 				return {
 					type: 'InlineComponent',
diff --git a/packages/svelte/src/compiler/types/legacy-nodes.d.ts b/packages/svelte/src/compiler/types/legacy-nodes.d.ts
index ba89520e20..15f1d4a6fc 100644
--- a/packages/svelte/src/compiler/types/legacy-nodes.d.ts
+++ b/packages/svelte/src/compiler/types/legacy-nodes.d.ts
@@ -1,4 +1,4 @@
-import type { StyleDirective as LegacyStyleDirective, Text } from '#compiler';
+import type { StyleDirective as LegacyStyleDirective, Text, Css } from '#compiler';
 import type {
 	ArrayExpression,
 	AssignmentExpression,
@@ -227,9 +227,17 @@ export type LegacyElementLike =
 	| LegacyTitle
 	| LegacyWindow;
 
+export interface LegacySelector extends BaseNode {
+	type: 'Selector';
+	children: Array<Css.Combinator | Css.SimpleSelector>;
+}
+
+export type LegacyCssNode = LegacySelector;
+
 export type LegacySvelteNode =
 	| LegacyConstTag
 	| LegacyElementLike
 	| LegacyAttributeLike
 	| LegacyAttributeShorthand
+	| LegacyCssNode
 	| Text;
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
index 9e13a7cb86..c00247c3b5 100644
--- a/packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json
+++ b/packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json
@@ -13,40 +13,56 @@
 					"end": 80,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"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",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 60,
+											"end": 62
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-of-type",
+											"args": {
+												"type": "SelectorList",
 												"start": 75,
 												"end": 79,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "2n+1",
+														"type": "ComplexSelector",
 														"start": 75,
-														"end": 79
+														"end": 79,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "2n+1",
+																		"start": 75,
+																		"end": 79
+																	}
+																],
+																"start": 75,
+																"end": 79
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 62,
+											},
+											"start": 62,
+											"end": 80
+										}
+									],
+									"start": 60,
 									"end": 80
 								}
 							]
@@ -78,52 +94,68 @@
 					"end": 153,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"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",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 117,
+											"end": 119
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 130,
 												"end": 152,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "-n + 3 of ",
+														"type": "ComplexSelector",
 														"start": 130,
-														"end": 140
-													},
-													{
-														"type": "TypeSelector",
-														"name": "li",
-														"start": 140,
-														"end": 142
-													},
-													{
-														"type": "ClassSelector",
-														"name": "important",
-														"start": 142,
-														"end": 152
+														"end": 152,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"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": 130,
+																"end": 152
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 119,
+											},
+											"start": 119,
+											"end": 153
+										}
+									],
+									"start": 117,
 									"end": 153
 								}
 							]
@@ -155,40 +187,56 @@
 					"end": 206,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"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",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 191,
+											"end": 193
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 204,
 												"end": 205,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "1",
+														"type": "ComplexSelector",
 														"start": 204,
-														"end": 205
+														"end": 205,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "1",
+																		"start": 204,
+																		"end": 205
+																	}
+																],
+																"start": 204,
+																"end": 205
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 193,
+											},
+											"start": 193,
+											"end": 206
+										}
+									],
+									"start": 191,
 									"end": 206
 								}
 							]
@@ -220,40 +268,56 @@
 					"end": 259,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 244,
 							"end": 259,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 244,
-									"end": 246
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-child",
-									"args": {
-										"type": "SelectorList",
-										"start": 257,
-										"end": 258,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 244,
+											"end": 246
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 257,
 												"end": 258,
 												"children": [
 													{
-														"type": "TypeSelector",
-														"name": "p",
+														"type": "ComplexSelector",
 														"start": 257,
-														"end": 258
+														"end": 258,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "TypeSelector",
+																		"name": "p",
+																		"start": 257,
+																		"end": 258
+																	}
+																],
+																"start": 257,
+																"end": 258
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 246,
+											},
+											"start": 246,
+											"end": 259
+										}
+									],
+									"start": 244,
 									"end": 259
 								}
 							]
@@ -285,40 +349,56 @@
 					"end": 314,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 297,
 							"end": 314,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 297,
-									"end": 299
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-child",
-									"args": {
-										"type": "SelectorList",
-										"start": 310,
-										"end": 313,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 297,
+											"end": 299
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 310,
 												"end": 313,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "n+7",
+														"type": "ComplexSelector",
 														"start": 310,
-														"end": 313
+														"end": 313,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "n+7",
+																		"start": 310,
+																		"end": 313
+																	}
+																],
+																"start": 310,
+																"end": 313
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 299,
+											},
+											"start": 299,
+											"end": 314
+										}
+									],
+									"start": 297,
 									"end": 314
 								}
 							]
@@ -350,40 +430,56 @@
 					"end": 370,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 352,
 							"end": 370,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 352,
-									"end": 354
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-child",
-									"args": {
-										"type": "SelectorList",
-										"start": 365,
-										"end": 369,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 352,
+											"end": 354
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 365,
 												"end": 369,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "even",
+														"type": "ComplexSelector",
 														"start": 365,
-														"end": 369
+														"end": 369,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "even",
+																		"start": 365,
+																		"end": 369
+																	}
+																],
+																"start": 365,
+																"end": 369
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 354,
+											},
+											"start": 354,
+											"end": 370
+										}
+									],
+									"start": 352,
 									"end": 370
 								}
 							]
@@ -415,40 +511,56 @@
 					"end": 425,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 408,
 							"end": 425,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 408,
-									"end": 410
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-child",
-									"args": {
-										"type": "SelectorList",
-										"start": 421,
-										"end": 424,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 408,
+											"end": 410
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 421,
 												"end": 424,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "odd",
+														"type": "ComplexSelector",
 														"start": 421,
-														"end": 424
+														"end": 424,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "odd",
+																		"start": 421,
+																		"end": 424
+																	}
+																],
+																"start": 421,
+																"end": 424
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 410,
+											},
+											"start": 410,
+											"end": 425
+										}
+									],
+									"start": 408,
 									"end": 425
 								}
 							]
@@ -480,40 +592,56 @@
 					"end": 492,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 463,
 							"end": 492,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 463,
-									"end": 465
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-child",
-									"args": {
-										"type": "SelectorList",
-										"start": 485,
-										"end": 486,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 463,
+											"end": 465
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-child",
+											"args": {
+												"type": "SelectorList",
 												"start": 485,
 												"end": 486,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "n",
+														"type": "ComplexSelector",
 														"start": 485,
-														"end": 486
+														"end": 486,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "n",
+																		"start": 485,
+																		"end": 486
+																	}
+																],
+																"start": 485,
+																"end": 486
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 465,
+											},
+											"start": 465,
+											"end": 492
+										}
+									],
+									"start": 463,
 									"end": 492
 								}
 							]
@@ -545,40 +673,56 @@
 					"end": 544,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 530,
 							"end": 544,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 530,
-									"end": 532
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "global",
-									"args": {
-										"type": "SelectorList",
-										"start": 540,
-										"end": 543,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 530,
+											"end": 532
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "global",
+											"args": {
+												"type": "SelectorList",
 												"start": 540,
 												"end": 543,
 												"children": [
 													{
-														"type": "TypeSelector",
-														"name": "nav",
+														"type": "ComplexSelector",
 														"start": 540,
-														"end": 543
+														"end": 543,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "TypeSelector",
+																		"name": "nav",
+																		"start": 540,
+																		"end": 543
+																	}
+																],
+																"start": 540,
+																"end": 543
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 532,
+											},
+											"start": 532,
+											"end": 544
+										}
+									],
+									"start": 530,
 									"end": 544
 								}
 							]
@@ -610,40 +754,56 @@
 					"end": 601,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 580,
 							"end": 601,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 580,
-									"end": 582
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-of-type",
-									"args": {
-										"type": "SelectorList",
-										"start": 595,
-										"end": 600,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 580,
+											"end": 582
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-of-type",
+											"args": {
+												"type": "SelectorList",
 												"start": 595,
 												"end": 600,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "10n+1",
+														"type": "ComplexSelector",
 														"start": 595,
-														"end": 600
+														"end": 600,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "10n+1",
+																		"start": 595,
+																		"end": 600
+																	}
+																],
+																"start": 595,
+																"end": 600
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 582,
+											},
+											"start": 582,
+											"end": 601
+										}
+									],
+									"start": 580,
 									"end": 601
 								}
 							]
@@ -675,40 +835,56 @@
 					"end": 657,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 636,
 							"end": 657,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 636,
-									"end": 638
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-of-type",
-									"args": {
-										"type": "SelectorList",
-										"start": 651,
-										"end": 656,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 636,
+											"end": 638
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-of-type",
+											"args": {
+												"type": "SelectorList",
 												"start": 651,
 												"end": 656,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "-2n+3",
+														"type": "ComplexSelector",
 														"start": 651,
-														"end": 656
+														"end": 656,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "-2n+3",
+																		"start": 651,
+																		"end": 656
+																	}
+																],
+																"start": 651,
+																"end": 656
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 638,
+											},
+											"start": 638,
+											"end": 657
+										}
+									],
+									"start": 636,
 									"end": 657
 								}
 							]
@@ -740,40 +916,61 @@
 					"end": 711,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 692,
 							"end": 711,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 692,
-									"end": 694
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-of-type",
-									"args": {
-										"type": "SelectorList",
-										"start": 707,
-										"end": 710,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 692,
+											"end": 694
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-of-type",
+											"args": {
+												"type": "SelectorList",
 												"start": 707,
 												"end": 710,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "+12",
+														"type": "ComplexSelector",
 														"start": 707,
-														"end": 710
+														"end": 710,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": {
+																	"type": "Combinator",
+																	"name": "+",
+																	"start": 707,
+																	"end": 708
+																},
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "12",
+																		"start": 708,
+																		"end": 710
+																	}
+																],
+																"start": 707,
+																"end": 710
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 694,
+											},
+											"start": 694,
+											"end": 711
+										}
+									],
+									"start": 692,
 									"end": 711
 								}
 							]
@@ -805,40 +1002,61 @@
 					"end": 765,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 746,
 							"end": 765,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
-									"start": 746,
-									"end": 748
-								},
-								{
-									"type": "PseudoClassSelector",
-									"name": "nth-of-type",
-									"args": {
-										"type": "SelectorList",
-										"start": 761,
-										"end": 764,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 746,
+											"end": 748
+										},
+										{
+											"type": "PseudoClassSelector",
+											"name": "nth-of-type",
+											"args": {
+												"type": "SelectorList",
 												"start": 761,
 												"end": 764,
 												"children": [
 													{
-														"type": "Nth",
-														"value": "+3n",
+														"type": "ComplexSelector",
 														"start": 761,
-														"end": 764
+														"end": 764,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": {
+																	"type": "Combinator",
+																	"name": "+",
+																	"start": 761,
+																	"end": 762
+																},
+																"selectors": [
+																	{
+																		"type": "Nth",
+																		"value": "3n",
+																		"start": 762,
+																		"end": 764
+																	}
+																],
+																"start": 761,
+																"end": 764
+															}
+														]
 													}
 												]
-											}
-										]
-									},
-									"start": 748,
+											},
+											"start": 748,
+											"end": 765
+										}
+									],
+									"start": 746,
 									"end": 765
 								}
 							]
diff --git a/packages/svelte/tests/parser-modern/samples/css-pseudo-classes/output.json b/packages/svelte/tests/parser-modern/samples/css-pseudo-classes/output.json
index 1431b123a4..25c5806aac 100644
--- a/packages/svelte/tests/parser-modern/samples/css-pseudo-classes/output.json
+++ b/packages/svelte/tests/parser-modern/samples/css-pseudo-classes/output.json
@@ -13,15 +13,23 @@
 					"end": 86,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 60,
 							"end": 86,
 							"children": [
 								{
-									"type": "PseudoElementSelector",
-									"name": "view-transition-old",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "PseudoElementSelector",
+											"name": "view-transition-old",
+											"start": 60,
+											"end": 81
+										}
+									],
 									"start": 60,
-									"end": 81
+									"end": 86
 								}
 							]
 						}
@@ -52,33 +60,49 @@
 					"end": 146,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 111,
 							"end": 146,
 							"children": [
 								{
-									"type": "PseudoClassSelector",
-									"name": "global",
-									"args": {
-										"type": "SelectorList",
-										"start": 119,
-										"end": 145,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "PseudoClassSelector",
+											"name": "global",
+											"args": {
+												"type": "SelectorList",
 												"start": 119,
 												"end": 145,
 												"children": [
 													{
-														"type": "PseudoElementSelector",
-														"name": "view-transition-old",
+														"type": "ComplexSelector",
 														"start": 119,
-														"end": 140
+														"end": 145,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "PseudoElementSelector",
+																		"name": "view-transition-old",
+																		"start": 119,
+																		"end": 140
+																	}
+																],
+																"start": 119,
+																"end": 145
+															}
+														]
 													}
 												]
-											}
-										]
-									},
+											},
+											"start": 111,
+											"end": 146
+										}
+									],
 									"start": 111,
 									"end": 146
 								}
@@ -111,15 +135,23 @@
 					"end": 199,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 171,
 							"end": 199,
 							"children": [
 								{
-									"type": "PseudoElementSelector",
-									"name": "highlight",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "PseudoElementSelector",
+											"name": "highlight",
+											"start": 171,
+											"end": 182
+										}
+									],
 									"start": 171,
-									"end": 182
+									"end": 199
 								}
 							]
 						}
@@ -150,21 +182,29 @@
 					"end": 245,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 220,
 							"end": 245,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "custom-element",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "custom-element",
+											"start": 220,
+											"end": 234
+										},
+										{
+											"type": "PseudoElementSelector",
+											"name": "part",
+											"start": 234,
+											"end": 240
+										}
+									],
 									"start": 220,
-									"end": 234
-								},
-								{
-									"type": "PseudoElementSelector",
-									"name": "part",
-									"start": 234,
-									"end": 240
+									"end": 245
 								}
 							]
 						}
@@ -195,15 +235,23 @@
 					"end": 285,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 266,
 							"end": 285,
 							"children": [
 								{
-									"type": "PseudoElementSelector",
-									"name": "slotted",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "PseudoElementSelector",
+											"name": "slotted",
+											"start": 266,
+											"end": 275
+										}
+									],
 									"start": 266,
-									"end": 275
+									"end": 285
 								}
 							]
 						}
@@ -234,58 +282,89 @@
 					"end": 359,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 306,
 							"end": 359,
 							"children": [
 								{
-									"type": "PseudoClassSelector",
-									"name": "is",
-									"args": {
-										"type": "SelectorList",
-										"start": 324,
-										"end": 355,
-										"children": [
-											{
-												"type": "Selector",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "PseudoClassSelector",
+											"name": "is",
+											"args": {
+												"type": "SelectorList",
 												"start": 324,
-												"end": 330,
-												"children": [
-													{
-														"type": "TypeSelector",
-														"name": "button",
-														"start": 324,
-														"end": 330
-													}
-												]
-											},
-											{
-												"type": "Selector",
-												"start": 349,
 												"end": 355,
 												"children": [
 													{
-														"type": "TypeSelector",
-														"name": "h1",
-														"start": 349,
-														"end": 351
-													},
-													{
-														"type": "Combinator",
-														"name": "+",
-														"start": 352,
-														"end": 353
+														"type": "ComplexSelector",
+														"start": 324,
+														"end": 330,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "TypeSelector",
+																		"name": "button",
+																		"start": 324,
+																		"end": 330
+																	}
+																],
+																"start": 324,
+																"end": 330
+															}
+														]
 													},
 													{
-														"type": "TypeSelector",
-														"name": "p",
-														"start": 354,
-														"end": 355
+														"type": "ComplexSelector",
+														"start": 349,
+														"end": 355,
+														"children": [
+															{
+																"type": "RelativeSelector",
+																"combinator": null,
+																"selectors": [
+																	{
+																		"type": "TypeSelector",
+																		"name": "h1",
+																		"start": 349,
+																		"end": 351
+																	}
+																],
+																"start": 349,
+																"end": 351
+															},
+															{
+																"type": "RelativeSelector",
+																"combinator": {
+																	"type": "Combinator",
+																	"name": "+",
+																	"start": 352,
+																	"end": 353
+																},
+																"selectors": [
+																	{
+																		"type": "TypeSelector",
+																		"name": "p",
+																		"start": 354,
+																		"end": 355
+																	}
+																],
+																"start": 351,
+																"end": 355
+															}
+														]
 													}
 												]
-											}
-										]
-									},
+											},
+											"start": 306,
+											"end": 359
+										}
+									],
 									"start": 306,
 									"end": 359
 								}
diff --git a/packages/svelte/tests/parser-modern/samples/semicolon-inside-quotes/output.json b/packages/svelte/tests/parser-modern/samples/semicolon-inside-quotes/output.json
index c6fbb599c7..72cd9907f2 100644
--- a/packages/svelte/tests/parser-modern/samples/semicolon-inside-quotes/output.json
+++ b/packages/svelte/tests/parser-modern/samples/semicolon-inside-quotes/output.json
@@ -21,13 +21,21 @@
 					"end": 139,
 					"children": [
 						{
-							"type": "Selector",
+							"type": "ComplexSelector",
 							"start": 137,
 							"end": 139,
 							"children": [
 								{
-									"type": "TypeSelector",
-									"name": "h1",
+									"type": "RelativeSelector",
+									"combinator": null,
+									"selectors": [
+										{
+											"type": "TypeSelector",
+											"name": "h1",
+											"start": 137,
+											"end": 139
+										}
+									],
 									"start": 137,
 									"end": 139
 								}