diff --git a/components/script/dom/eventtarget.rs b/components/script/dom/eventtarget.rs
index bdd5a4b4f45..334c3c47360 100644
--- a/components/script/dom/eventtarget.rs
+++ b/components/script/dom/eventtarget.rs
@@ -41,6 +41,7 @@ use crate::dom::bindings::codegen::Bindings::NodeBinding::GetRootNodeOptions;
 use crate::dom::bindings::codegen::Bindings::NodeBinding::Node_Binding::NodeMethods;
 use crate::dom::bindings::codegen::Bindings::ShadowRootBinding::ShadowRoot_Binding::ShadowRootMethods;
 use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
+use crate::dom::bindings::codegen::InheritTypes::{CharacterDataTypeId, NodeTypeId};
 use crate::dom::bindings::codegen::UnionTypes::{
     AddEventListenerOptionsOrBoolean, EventListenerOptionsOrBoolean, EventOrString,
 };
@@ -58,6 +59,7 @@ use crate::dom::globalscope::GlobalScope;
 use crate::dom::htmlformelement::FormControlElementHelpers;
 use crate::dom::node::{Node, NodeTraits};
 use crate::dom::shadowroot::ShadowRoot;
+use crate::dom::text::Text;
 use crate::dom::virtualmethods::VirtualMethods;
 use crate::dom::window::Window;
 use crate::dom::workerglobalscope::WorkerGlobalScope;
@@ -815,9 +817,30 @@ impl EventTarget {
         }
 
         if let Some(node) = self.downcast::<Node>() {
-            // FIXME: Handle slottables here
-            let parent = node.GetParentNode()?;
-            return Some(DomRoot::from_ref(parent.upcast::<EventTarget>()));
+            // > A node’s get the parent algorithm, given an event, returns the node’s assigned slot,
+            // > if node is assigned; otherwise node’s parent.
+            let assigned_slot = match node.type_id() {
+                NodeTypeId::Element(_) => {
+                    let element = node.downcast::<Element>().unwrap();
+                    element
+                        .assigned_slot()
+                        .map(|slot| DomRoot::from_ref(slot.upcast::<EventTarget>()))
+                },
+                NodeTypeId::CharacterData(CharacterDataTypeId::Text(_)) => {
+                    let text = node.downcast::<Text>().unwrap();
+                    text.slottable_data()
+                        .borrow()
+                        .assigned_slot
+                        .as_ref()
+                        .map(|slot| DomRoot::from_ref(slot.upcast::<EventTarget>()))
+                },
+                _ => None,
+            };
+
+            return assigned_slot.or_else(|| {
+                node.GetParentNode()
+                    .map(|parent| DomRoot::from_ref(parent.upcast::<EventTarget>()))
+            });
         }
 
         None
diff --git a/tests/wpt/meta/shadow-dom/event-composed-path.html.ini b/tests/wpt/meta/shadow-dom/event-composed-path.html.ini
index 13babc698bc..107a7c4310e 100644
--- a/tests/wpt/meta/shadow-dom/event-composed-path.html.ini
+++ b/tests/wpt/meta/shadow-dom/event-composed-path.html.ini
@@ -1,12 +1,6 @@
 [event-composed-path.html]
-  [Event Path with a slot in an open Shadow Root.]
-    expected: FAIL
-
   [Event Path with a slot in a closed Shadow Root.]
     expected: FAIL
 
-  [Event Path with slots in nested ShadowRoots: open > open.]
-    expected: FAIL
-
   [Event Path with slots in nested ShadowRoots: closed > closed.]
     expected: FAIL