diff --git a/Userland/Libraries/LibWeb/DOM/ParentNode.cpp b/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
index 8562c151c8..a55f7631e8 100644
--- a/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
@@ -11,11 +11,11 @@
 
 namespace Web::DOM {
 
-RefPtr<Element> ParentNode::query_selector(const StringView& selector_text)
+ExceptionOr<RefPtr<Element>> ParentNode::query_selector(StringView selector_text)
 {
     auto maybe_selectors = parse_selector(CSS::ParsingContext(*this), selector_text);
     if (!maybe_selectors.has_value())
-        return {};
+        return DOM::SyntaxError::create("Failed to parse selector");
 
     auto selectors = maybe_selectors.value();
 
@@ -36,11 +36,11 @@ RefPtr<Element> ParentNode::query_selector(const StringView& selector_text)
     return result;
 }
 
-NonnullRefPtrVector<Element> ParentNode::query_selector_all(const StringView& selector_text)
+ExceptionOr<NonnullRefPtrVector<Element>> ParentNode::query_selector_all(StringView selector_text)
 {
     auto maybe_selectors = parse_selector(CSS::ParsingContext(*this), selector_text);
     if (!maybe_selectors.has_value())
-        return {};
+        return DOM::SyntaxError::create("Failed to parse selector");
 
     auto selectors = maybe_selectors.value();
 
diff --git a/Userland/Libraries/LibWeb/DOM/ParentNode.h b/Userland/Libraries/LibWeb/DOM/ParentNode.h
index 856c5a4597..d977cc8f7d 100644
--- a/Userland/Libraries/LibWeb/DOM/ParentNode.h
+++ b/Userland/Libraries/LibWeb/DOM/ParentNode.h
@@ -22,8 +22,8 @@ public:
     RefPtr<Element> last_element_child();
     u32 child_element_count() const;
 
-    RefPtr<Element> query_selector(const StringView&);
-    NonnullRefPtrVector<Element> query_selector_all(const StringView&);
+    ExceptionOr<RefPtr<Element>> query_selector(StringView);
+    ExceptionOr<NonnullRefPtrVector<Element>> query_selector_all(StringView);
 
 protected:
     ParentNode(Document& document, NodeType type)