feat: [#1642] Adds support for child combinator to :has pseudo selector (#1660)

Author: capricorn86

packages/happy-dom/src/query-selector/SelectorItem.ts

@@ -340,6 +340,16 @@ export default class SelectorItem {
 							priorityWeightForHas = match.priorityWeight;
 						}
 					}
+				} else if (pseudo.arguments[0] === '>') {
+					for (const selectorItem of pseudo.selectorItems) {
+						for (const child of element[PropertySymbol.elementArray]) {
+							const match = selectorItem.match(child);
+							if (match && priorityWeightForHas < match.priorityWeight) {
+								priorityWeightForHas = match.priorityWeight;
+								break;
+							}
+						}
+					}
 				} else {
 					for (const selectorItem of pseudo.selectorItems) {
 						const match = this.matchChildOfElement(selectorItem, element);

packages/happy-dom/src/query-selector/SelectorParser.ts

@@ -277,6 +277,10 @@ export default class SelectorParser {
 	): ISelectorPseudo {
 		const lowerName = name.toLowerCase();
 
+		if (args) {
+			args = args.trim();
+		}
+
 		if (!args) {
 			return { name: lowerName, arguments: null, selectorItems: null, nthFunction: null };
 		}
@@ -328,10 +332,13 @@ export default class SelectorParser {
 
 				// The ":has()" pseudo selector doesn't allow for it to be nested inside another ":has()" pseudo selector, as it can lead to cyclic querying.
 				if (!args.includes(':has(')) {
-					for (const group of this.getSelectorGroups(
-						args[0] === '+' ? args.replace('+', '') : args,
-						options
-					)) {
+					let newArgs = args;
+					if (args[0] === '+') {
+						newArgs = args.replace('+', '');
+					} else if (args[0] === '>') {
+						newArgs = args.replace('>', '');
+					}
+					for (const group of this.getSelectorGroups(newArgs, options)) {
 						hasSelectorItems.push(group[0]);
 					}
 				}

packages/happy-dom/test/query-selector/QuerySelector.test.ts

@@ -1205,9 +1205,12 @@ describe('QuerySelector', () => {
 			expect(Array.from(container.querySelectorAll('span:has(+video)'))).toEqual([
 				container.children[1]
 			]);
-			expect(Array.from(container.querySelectorAll('h1:has(+h2)'))).toEqual([
+			expect(Array.from(container.querySelectorAll('h1:has( +h2)'))).toEqual([
 				container.children[3]
 			]);
+			expect(Array.from(container.querySelectorAll('span:has(> video)'))).toEqual([
+				container.children[0]
+			]);
 		});
 	});