1 files changed, 12 insertions, 0 deletions
diff --git a/components/script/layout_dom/element.rs b/components/script/layout_dom/element.rs
index 94e2676fff5..e4e20b1c1ab 100644
--- a/components/script/layout_dom/element.rs
+++ b/components/script/layout_dom/element.rs
@@ -506,6 +506,12 @@ impl<'dom, LayoutDataType: LayoutDataTrait> ::selectors::Element
         None
     }
 
+    fn first_element_child(&self) -> Option<Self> {
+        self.as_node()
+            .dom_children()
+            .find_map(|child| child.as_element())
+    }
+
     fn attr_matches(
         &self,
         ns: &NamespaceConstraint<&style::Namespace>,
@@ -801,6 +807,12 @@ impl<'dom, LayoutDataType: LayoutDataTrait> ::selectors::Element
         None
     }
 
+    // Skips non-element nodes
+    fn first_element_child(&self) -> Option<Self> {
+        warn!("ServoThreadSafeLayoutElement::first_element_child called");
+        None
+    }
+
     fn is_html_slot_element(&self) -> bool {
         self.element.is_html_slot_element()
     }