fix: instead of deleting, add a new attribute to class

instead of deleting the <a> element from the Set, add a new attribute to to indicate it doesnt need a child

src/compiler/compile/nodes/Element.ts

@@ -225,6 +225,7 @@ export default class Element extends Node {
 	namespace: string;
 	needs_manual_style_scoping: boolean;
 	tag_expr: Expression;
+	contains_a11y_label: boolean;
 
 	get is_dynamic_element() {
 		return this.name === 'svelte:element';
@@ -644,7 +645,7 @@ export default class Element extends Node {
 			if (aria_label_attribute) {
 				const aria_value = aria_label_attribute.get_static_value();
 				if (aria_value != '') {
-					a11y_required_content.delete('a');
+					this.contains_a11y_label = true;
 				}
 			}
 			if (href_attribute) {
@@ -927,6 +928,7 @@ export default class Element extends Node {
 
 	validate_content() {
 		if (!a11y_required_content.has(this.name)) return;
+		if (this.contains_a11y_label) return;
 		if (
 			this.bindings
 				.some((binding) => ['textContent', 'innerHTML'].includes(binding.name))