From fe43014ae1d0110dcd8b40ea249db01826638160 Mon Sep 17 00:00:00 2001
From: Jordan Pittman <jordan@cryptica.me>
Date: Fri, 23 May 2025 14:45:36 -0400
Subject: [PATCH] Ignore consecutive semicolons in the CSS parser

---
 packages/tailwindcss/src/css-parser.test.ts | 48 ++++++++++++++-------
 packages/tailwindcss/src/css-parser.ts      |  2 +-
 2 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/packages/tailwindcss/src/css-parser.test.ts b/packages/tailwindcss/src/css-parser.test.ts
index f7ee47a61145..0a180f6be90d 100644
--- a/packages/tailwindcss/src/css-parser.test.ts
+++ b/packages/tailwindcss/src/css-parser.test.ts
@@ -1063,6 +1063,38 @@ describe.each(['Unix', 'Windows'])('Line endings: %s', (lineEndings) => {
         },
       ])
     })
+
+    it('should ignore consecutive semicolons', () => {
+      expect(parse(';;;')).toEqual([])
+    })
+
+    it('should ignore semicolons after an at-rule with a body', () => {
+      expect(parse('@plugin "foo" {} ;')).toEqual([
+        {
+          kind: 'at-rule',
+          name: '@plugin',
+          params: '"foo"',
+          nodes: [],
+        },
+      ])
+    })
+
+    it('should ignore consecutive semicolons a declaration', () => {
+      expect(parse('.foo { color: red;;; }')).toEqual([
+        {
+          kind: 'rule',
+          selector: '.foo',
+          nodes: [
+            {
+              kind: 'declaration',
+              property: 'color',
+              value: 'red',
+              important: false,
+            },
+          ],
+        },
+      ])
+    })
   })
 
   describe('errors', () => {
@@ -1137,22 +1169,6 @@ describe.each(['Unix', 'Windows'])('Line endings: %s', (lineEndings) => {
         `[Error: Invalid declaration: \`bar\`]`,
       )
     })
-
-    it('should error when a semicolon exists after an at-rule with a body', () => {
-      expect(() => parse('@plugin "foo" {} ;')).toThrowErrorMatchingInlineSnapshot(
-        `[Error: Unexpected semicolon]`,
-      )
-    })
-
-    it('should error when consecutive semicolons exist', () => {
-      expect(() => parse(';;;')).toThrowErrorMatchingInlineSnapshot(`[Error: Unexpected semicolon]`)
-    })
-
-    it('should error when consecutive semicolons exist after a declaration', () => {
-      expect(() => parse('.foo { color: red;;; }')).toThrowErrorMatchingInlineSnapshot(
-        `[Error: Unexpected semicolon]`,
-      )
-    })
   })
 
   it('ignores BOM at the beginning of a file', () => {
diff --git a/packages/tailwindcss/src/css-parser.ts b/packages/tailwindcss/src/css-parser.ts
index 6a5ce83204bd..fe621e3fa134 100644
--- a/packages/tailwindcss/src/css-parser.ts
+++ b/packages/tailwindcss/src/css-parser.ts
@@ -391,7 +391,7 @@ export function parse(input: string, opts?: ParseOptions) {
     ) {
       let declaration = parseDeclaration(buffer)
       if (!declaration) {
-        if (buffer.length === 0) throw new Error('Unexpected semicolon')
+        if (buffer.length === 0) continue
         throw new Error(`Invalid declaration: \`${buffer.trim()}\``)
       }