From e995b0dcef00ed85ba430723f759ccf9e99c7a83 Mon Sep 17 00:00:00 2001
From: btea <2356281422@qq.com>
Date: Sat, 25 Feb 2023 12:38:29 +0800
Subject: [PATCH] #792@minor: Handle special pseudo selector.

---
 .../happy-dom/src/query-selector/QuerySelector.ts    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/packages/happy-dom/src/query-selector/QuerySelector.ts b/packages/happy-dom/src/query-selector/QuerySelector.ts
index 704f34a56..b424045dc 100644
--- a/packages/happy-dom/src/query-selector/QuerySelector.ts
+++ b/packages/happy-dom/src/query-selector/QuerySelector.ts
@@ -285,7 +285,17 @@ export default class QuerySelector {
 		}
 
 		if (parts.length > 0) {
-			groups.push(parts);
+			// Handle special pseudo-class selectors, such as: nth-child(2n + 1)
+			const newParts = [];
+			for (let i = 0; i < parts.length; i++) {
+				if (parts[i].includes('(') && parts[i + 1] === '+' && parts[i + 2].includes(')')) {
+					newParts.push(parts[i] + parts[i + 1] + parts[i + 2]);
+					i += 2;
+				} else {
+					newParts.push(parts[i]);
+				}
+			}
+			groups.push(newParts);
 		}
 
 		return groups;