diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 74780f684a..ff1eed3ac0 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -1963,7 +1963,7 @@ DeprecatedString Document::cookie(Cookie::Source source)
 {
     if (auto* page = this->page())
         return page->client().page_did_request_cookie(m_url, source);
-    return {};
+    return DeprecatedString::empty();
 }
 
 void Document::set_cookie(StringView cookie_string, Cookie::Source source)
diff --git a/Userland/Libraries/LibWeb/DOM/Element.cpp b/Userland/Libraries/LibWeb/DOM/Element.cpp
index e77c260508..745d742981 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Element.cpp
@@ -150,7 +150,7 @@ DeprecatedString Element::deprecated_get_attribute(StringView name) const
 {
     auto maybe_attribute = get_attribute(name);
     if (!maybe_attribute.has_value())
-        return {};
+        return DeprecatedString::empty();
 
     return maybe_attribute->to_deprecated_string();
 }
diff --git a/Userland/Libraries/LibWeb/DOM/ParentNode.cpp b/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
index 6ff1be43df..612e73d15e 100644
--- a/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ParentNode.cpp
@@ -170,9 +170,9 @@ JS::NonnullGCPtr<HTMLCollection> ParentNode::get_elements_by_tag_name_ns(Depreca
     auto local_name = MUST(FlyString::from_deprecated_fly_string(deprecated_local_name));
 
     // 1. If namespace is the empty string, set it to null.
-    DeprecatedString namespace_ = nullable_namespace;
-    if (namespace_.is_empty())
-        namespace_ = {};
+    DeprecatedFlyString namespace_;
+    if (!nullable_namespace.is_null() && !nullable_namespace.is_empty())
+        namespace_ = nullable_namespace;
 
     // 2. If both namespace and localName are "*" (U+002A), return a HTMLCollection rooted at root, whose filter matches descendant elements.
     if (namespace_ == "*" && local_name == "*") {
diff --git a/Userland/Libraries/LibWeb/HTML/FormAssociatedElement.cpp b/Userland/Libraries/LibWeb/HTML/FormAssociatedElement.cpp
index 039ca5c62b..9fe3b371ac 100644
--- a/Userland/Libraries/LibWeb/HTML/FormAssociatedElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/FormAssociatedElement.cpp
@@ -102,9 +102,9 @@ void FormAssociatedElement::reset_form_owner()
     // 4. If element is listed, has a form content attribute, and is connected, then:
     if (is_listed() && html_element.has_attribute(HTML::AttributeNames::form) && html_element.is_connected()) {
         // 1. If the first element in element's tree, in tree order, to have an ID that is identical to element's form content attribute's value, is a form element, then associate the element with that form element.
-        auto form_value = html_element.deprecated_attribute(HTML::AttributeNames::form);
+        auto form_value = html_element.attribute(HTML::AttributeNames::form);
         html_element.root().for_each_in_inclusive_subtree_of_type<HTMLFormElement>([this, &form_value](HTMLFormElement& form_element) {
-            if (form_element.deprecated_attribute(HTML::AttributeNames::id) == form_value) {
+            if (form_element.attribute(HTML::AttributeNames::id) == form_value) {
                 set_form(&form_element);
                 return IterationDecision::Break;
             }