diff --git a/Libraries/LibWeb/DOM/Attr.cpp b/Libraries/LibWeb/DOM/Attr.cpp
index 8f6fbdcdabe..2010c6f7e67 100644
--- a/Libraries/LibWeb/DOM/Attr.cpp
+++ b/Libraries/LibWeb/DOM/Attr.cpp
@@ -70,42 +70,35 @@ void Attr::set_owner_element(Element* owner_element)
     m_owner_element = owner_element;
 }
 
-// FIXME: Trusted Types integration with DOM is still under review https://github.com/whatwg/dom/pull/1268
-// https://whatpr.org/dom/1268.html#set-an-existing-attribute-value
+// https://dom.spec.whatwg.org/#set-an-existing-attribute-value
 WebIDL::ExceptionOr<void> Attr::set_value(String value)
 {
-    // 1. If attribute’s element is null, then set attribute’s value to value.
+    // 1. If attribute’s element is null, then set attribute’s value to value and return.
     if (!owner_element()) {
         m_value = move(value);
+        return {};
     }
-    // 2. Otherwise:
-    else {
-        // 1. Let element be attribute’s element.
-        auto const* element = owner_element();
 
-        // 2. Let verifiedValue be the result of calling get Trusted Types-compliant attribute value with
-        //    attribute’s local name, attribute’s namespace, element, and value.
-        auto const verified_value = TRY(TrustedTypes::get_trusted_types_compliant_attribute_value(
-            local_name(),
-            namespace_uri().has_value() ? Utf16String::from_utf8(namespace_uri().value()) : Optional<Utf16String>(),
-            *element,
-            Utf16String::from_utf8(value)));
+    // 2. Let element be attribute’s element.
+    auto const& element = *owner_element();
 
-        // 3. If attribute’s element is null, then set attribute’s value to verifiedValue, and return.
-        if (!owner_element()) {
-            m_value = verified_value.to_utf8_but_should_be_ported_to_utf16();
-            return {};
-        }
+    // 3. Let verifiedValue be the result of calling get Trusted Types-compliant attribute value with
+    //    attribute’s local name, attribute’s namespace, element, and value.
+    auto const verified_value = TRY(TrustedTypes::get_trusted_types_compliant_attribute_value(
+        local_name(),
+        namespace_uri().has_value() ? Utf16String::from_utf8(namespace_uri().value()) : Optional<Utf16String>(),
+        element,
+        Utf16String::from_utf8(value)));
 
-        // 4. If attribute’s element is not element, then return.
-        if (owner_element() != element) {
-            return {};
-        }
-
-        // 5. Change attribute to verifiedValue.
-        change_attribute(verified_value.to_utf8_but_should_be_ported_to_utf16());
+    // 4. If attribute’s element is null, then set attribute’s value to verifiedValue, and return.
+    if (!owner_element()) {
+        m_value = verified_value.to_utf8_but_should_be_ported_to_utf16();
+        return {};
     }
 
+    // 5. Change attribute to verifiedValue.
+    change_attribute(verified_value.to_utf8_but_should_be_ported_to_utf16());
+
     return {};
 }
 
diff --git a/Libraries/LibWeb/DOM/Element.cpp b/Libraries/LibWeb/DOM/Element.cpp
index 57568a6f0c0..bbb4fd4e38a 100644
--- a/Libraries/LibWeb/DOM/Element.cpp
+++ b/Libraries/LibWeb/DOM/Element.cpp
@@ -210,8 +210,7 @@ GC::Ptr<Attr> Element::get_attribute_node_ns(Optional<FlyString> const& namespac
     return m_attributes->get_attribute_ns(namespace_, name);
 }
 
-// FIXME: Trusted Types integration with DOM is still under review https://github.com/whatwg/dom/pull/1268
-// https://whatpr.org/dom/1268.html#dom-element-setattribute
+// https://dom.spec.whatwg.org/#dom-element-setattribute
 WebIDL::ExceptionOr<void> Element::set_attribute_for_bindings(FlyString qualified_name, Variant<GC::Root<TrustedTypes::TrustedHTML>, GC::Root<TrustedTypes::TrustedScript>, GC::Root<TrustedTypes::TrustedScriptURL>, Utf16String> const& value)
 {
     // 1. If qualifiedName is not a valid attribute local name, then throw an "InvalidCharacterError" DOMException.
@@ -230,23 +229,23 @@ WebIDL::ExceptionOr<void> Element::set_attribute_for_bindings(FlyString qualifie
     // 4. Let attribute be the first attribute in this’s attribute list whose qualified name is qualifiedName, and null otherwise.
     auto* attribute = attributes()->get_attribute(qualified_name);
 
-    // 5. If attribute is null, create an attribute whose local name is qualifiedName, value is verifiedValue, and node document
-    //    is this’s node document, then append this attribute to this, and then return.
-    if (!attribute) {
-        auto new_attribute = Attr::create(document(), qualified_name, verified_value.to_utf8_but_should_be_ported_to_utf16());
-        m_attributes->append_attribute(new_attribute);
-
+    // 5. If attribute is non-null, then change attribute to verifiedValue and return.
+    if (attribute) {
+        attribute->change_attribute(verified_value.to_utf8_but_should_be_ported_to_utf16());
         return {};
     }
 
-    // 6. Change attribute to verifiedValue.
-    attribute->change_attribute(verified_value.to_utf8_but_should_be_ported_to_utf16());
+    // 6. Set attribute to a new attribute whose local name is qualifiedName, value is verifiedValue,
+    //    and node document is this’s node document.
+    attribute = Attr::create(document(), qualified_name, verified_value.to_utf8_but_should_be_ported_to_utf16());
+
+    // 7. Append attribute to this.
+    m_attributes->append_attribute(*attribute);
 
     return {};
 }
 
-// FIXME: Trusted Types integration with DOM is still under review https://github.com/whatwg/dom/pull/1268
-// https://whatpr.org/dom/1268.html#dom-element-setattribute
+// https://dom.spec.whatwg.org/#dom-element-setattribute
 WebIDL::ExceptionOr<void> Element::set_attribute_for_bindings(FlyString qualified_name, Variant<GC::Root<TrustedTypes::TrustedHTML>, GC::Root<TrustedTypes::TrustedScript>, GC::Root<TrustedTypes::TrustedScriptURL>, String> const& value)
 {
     return set_attribute_for_bindings(move(qualified_name),
@@ -365,8 +364,7 @@ WebIDL::ExceptionOr<QualifiedName> validate_and_extract(JS::Realm& realm, Option
     return QualifiedName { local_name, prefix, namespace_ };
 }
 
-// FIXME: Trusted Types integration with DOM is still under review https://github.com/whatwg/dom/pull/1268
-// https://whatpr.org/dom/1268.html#dom-element-setattributens
+// https://dom.spec.whatwg.org/#dom-element-setattributens
 WebIDL::ExceptionOr<void> Element::set_attribute_ns_for_bindings(Optional<FlyString> const& namespace_, FlyString const& qualified_name, Variant<GC::Root<TrustedTypes::TrustedHTML>, GC::Root<TrustedTypes::TrustedScript>, GC::Root<TrustedTypes::TrustedScriptURL>, Utf16String> const& value)
 {
     // 1. Let (namespace, prefix, localName) be the result of validating and extracting namespace and qualifiedName given "element".
@@ -378,9 +376,7 @@ WebIDL::ExceptionOr<void> Element::set_attribute_ns_for_bindings(Optional<FlyStr
         extracted_qualified_name.local_name(),
         extracted_qualified_name.namespace_().has_value() ? Utf16String::from_utf8(extracted_qualified_name.namespace_().value()) : Optional<Utf16String>(),
         *this,
-        value.visit(
-            [](auto const& trusted_type) -> Variant<GC::Root<TrustedTypes::TrustedHTML>, GC::Root<TrustedTypes::TrustedScript>, GC::Root<TrustedTypes::TrustedScriptURL>, Utf16String> { return trusted_type; },
-            [](String const& string) -> Variant<GC::Root<TrustedTypes::TrustedHTML>, GC::Root<TrustedTypes::TrustedScript>, GC::Root<TrustedTypes::TrustedScriptURL>, Utf16String> { return Utf16String::from_utf8(string); })));
+        value));
 
     // 3. Set an attribute value for this using localName, verifiedValue, and also prefix and namespace.
     set_attribute_value(extracted_qualified_name.local_name(), verified_value.to_utf8_but_should_be_ported_to_utf16(), extracted_qualified_name.prefix(), extracted_qualified_name.namespace_());
diff --git a/Libraries/LibWeb/DOM/NamedNodeMap.cpp b/Libraries/LibWeb/DOM/NamedNodeMap.cpp
index bef2f9cf0a7..df7f6591e20 100644
--- a/Libraries/LibWeb/DOM/NamedNodeMap.cpp
+++ b/Libraries/LibWeb/DOM/NamedNodeMap.cpp
@@ -195,8 +195,7 @@ Attr const* NamedNodeMap::get_attribute_ns(Optional<FlyString> const& namespace_
     return nullptr;
 }
 
-// FIXME: Trusted Types integration with DOM is still under review https://github.com/whatwg/dom/pull/1268
-// https://whatpr.org/dom/1268.html#concept-element-attributes-set
+// https://dom.spec.whatwg.org/#concept-element-attributes-set
 WebIDL::ExceptionOr<GC::Ptr<Attr>> NamedNodeMap::set_attribute(Attr& attribute)
 {
     // 1. Let verifiedValue be the result of calling get Trusted Types-compliant attribute value