4 files changed, 60 insertions, 0 deletions
diff --git a/components/layout_thread/dom_wrapper.rs b/components/layout_thread/dom_wrapper.rs
index 5d815517532..466d844418a 100644
--- a/components/layout_thread/dom_wrapper.rs
+++ b/components/layout_thread/dom_wrapper.rs
@@ -514,6 +514,10 @@ impl<'le> TElement for ServoLayoutElement<'le> {
         false
     }
 
+    fn exports_any_part(&self) -> bool {
+        false
+    }
+
     fn style_attribute(&self) -> Option<ArcBorrow<StyleLocked<PropertyDeclarationBlock>>> {
         unsafe {
             (*self.element.style_attribute())
@@ -999,6 +1003,14 @@ impl<'le> ::selectors::Element for ServoLayoutElement<'le> {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
     #[inline]
     fn has_class(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
         unsafe { self.element.has_class_for_layout(name, case_sensitivity) }
@@ -1533,6 +1545,16 @@ impl<'le> ::selectors::Element for ServoThreadSafeLayoutElement<'le> {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        debug!("ServoThreadSafeLayoutElement::exported_part called");
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        debug!("ServoThreadSafeLayoutElement::imported_part called");
+        None
+    }
+
     fn has_class(&self, _name: &Atom, _case_sensitivity: CaseSensitivity) -> bool {
         debug!("ServoThreadSafeLayoutElement::has_class called");
         false
diff --git a/components/layout_thread_2020/dom_wrapper.rs b/components/layout_thread_2020/dom_wrapper.rs
index a9f09e11073..520014837db 100644
--- a/components/layout_thread_2020/dom_wrapper.rs
+++ b/components/layout_thread_2020/dom_wrapper.rs
@@ -521,6 +521,10 @@ impl<'le> TElement for ServoLayoutElement<'le> {
         false
     }
 
+    fn exports_any_part(&self) -> bool {
+        false
+    }
+
     fn style_attribute(&self) -> Option<ArcBorrow<StyleLocked<PropertyDeclarationBlock>>> {
         unsafe {
             (*self.element.style_attribute())
@@ -1006,6 +1010,14 @@ impl<'le> ::selectors::Element for ServoLayoutElement<'le> {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
     #[inline]
     fn has_class(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
         unsafe { self.element.has_class_for_layout(name, case_sensitivity) }
@@ -1540,6 +1552,16 @@ impl<'le> ::selectors::Element for ServoThreadSafeLayoutElement<'le> {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        debug!("ServoThreadSafeLayoutElement::exported_part called");
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        debug!("ServoThreadSafeLayoutElement::imported_part called");
+        None
+    }
+
     fn has_class(&self, _name: &Atom, _case_sensitivity: CaseSensitivity) -> bool {
         debug!("ServoThreadSafeLayoutElement::has_class called");
         false
diff --git a/components/script/dom/element.rs b/components/script/dom/element.rs
index baf4fcd0878..f359c43a18f 100644
--- a/components/script/dom/element.rs
+++ b/components/script/dom/element.rs
@@ -3073,6 +3073,14 @@ impl<'a> SelectorsElement for DomRoot<Element> {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
     fn has_class(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
         Element::has_class(&**self, name, case_sensitivity)
     }
diff --git a/components/style/servo/selector_parser.rs b/components/style/servo/selector_parser.rs
index 72c47e65dda..977a6c59a85 100644
--- a/components/style/servo/selector_parser.rs
+++ b/components/style/servo/selector_parser.rs
@@ -700,6 +700,14 @@ impl ElementSnapshot for ServoElementSnapshot {
         false
     }
 
+    fn exported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
+    fn imported_part(&self, _: &Atom) -> Option<Atom> {
+        None
+    }
+
     fn has_class(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
         self.get_attr(&ns!(), &local_name!("class"))
             .map_or(false, |v| {