fix: allow comments after last selector in css (#11723)

Fixes #11721

.changeset/clever-maps-travel.md

@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: allow comments after last selector in css

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

@@ -139,7 +139,7 @@ function read_selector_list(parser, inside_pseudo_class = false) {
 
 		const end = parser.index;
 
-		parser.allow_whitespace();
+		allow_comment_or_whitespace(parser);
 
 		if (inside_pseudo_class ? parser.match(')') : parser.match('{')) {
 			return {
@@ -324,7 +324,7 @@ function read_selector(parser, inside_pseudo_class = false) {
 		}
 
 		const index = parser.index;
-		parser.allow_whitespace();
+		allow_comment_or_whitespace(parser);
 
 		if (parser.match(',') || (inside_pseudo_class ? parser.match(')') : parser.match('{'))) {
 			// rewind, so we know whether to continue building the selector list

packages/svelte/tests/css/samples/comments-after-last-selector/expected.css

@@ -0,0 +1,6 @@
+
+	.foo.svelte-xyz,  /* some comment */
+	.bar.svelte-xyz /* some other comment */
+	{
+		color: red;
+	}

packages/svelte/tests/css/samples/comments-after-last-selector/input.svelte

@@ -0,0 +1,10 @@
+<div class="foo">foo</div>
+<div class="bar">bar</div>
+
+<style>
+	.foo,  /* some comment */
+	.bar /* some other comment */
+	{
+		color: red;
+	}
+</style>