do we even need this?

Author: navorite

packages/svelte/src/compiler/phases/1-parse/read/style.js

@@ -290,7 +290,7 @@ function read_selector(parser, inside_pseudo_class = false) {
 			// nth of matcher must come before combinator matcher to prevent collision else the '+' in '+2n-1' would be parsed as a combinator
 			children.push({
 				type: 'Nth',
-				value: /** @type {string} */ (parser.read(REGEX_NTH_OF)),
+				value: /** @type {string} */ (parser.read(REGEX_NTH_OF)?.trimEnd()), // in case it ends with 'of'
 				start,
 				end: parser.index
 			});

packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json

@@ -103,7 +103,7 @@
 												"children": [
 													{
 														"type": "Nth",
-														"value": "-n + 3 of ",
+														"value": "-n + 3 of",
 														"start": 130,
 														"end": 140
 													},
@@ -907,4 +907,4 @@
 		"transparent": false
 	},
 	"options": null
-}
+}