1 files changed, 6 insertions, 0 deletions
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 36712a99be6..3d178a5ab89 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -28,6 +28,7 @@ use gecko_bindings::bindings::Gecko_StoreStyleDifference;
 use gecko_bindings::structs;
 use gecko_bindings::structs::{NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO, NODE_IS_DIRTY_FOR_SERVO};
 use gecko_bindings::structs::{nsIAtom, nsIContent, nsStyleContext};
+use gecko_bindings::structs::NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE;
 use parking_lot::RwLock;
 use parser::ParserContextExtraData;
 use properties::{ComputedValues, parse_style_attribute};
@@ -624,4 +625,9 @@ impl<'le> ElementExt for GeckoElement<'le> {
     fn is_link(&self) -> bool {
         self.match_non_ts_pseudo_class(NonTSPseudoClass::AnyLink)
     }
+
+    #[inline]
+    fn matches_user_and_author_rules(&self) -> bool {
+        self.flags() & (NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE as u32) == 0
+    }
 }