capricorn86#728@patch: Use proxy for attributes getter.

packages/happy-dom/src/nodes/element/Element.ts

@@ -255,7 +255,21 @@ export default class Element extends Node implements IElement {
 	 * @returns Attributes.
 	 */
 	public get attributes(): INamedNodeMap {
-		return Object.assign(new NamedNodeMap(this), Object.values(this._attributes), this._attributes);
+		const nodeMap = new NamedNodeMap(this);
+		return new Proxy(nodeMap, {
+			get: (target, name) => {
+				if (name in target && typeof target[name] === 'function') {
+					return (...args) => target[name](...args);
+				}
+
+				return (
+					target[name] ||
+					(typeof name === 'string' || typeof name === 'number'
+						? this._attributes[name]
+						: undefined)
+				);
+			}
+		});
 	}
 
 	/**
@@ -1076,4 +1090,4 @@ export default class Element extends Node implements IElement {
 		}
 		return name.toLowerCase();
 	}
-}
+}