diff --git a/components/style/invalidation/element/collector.rs b/components/style/invalidation/element/collector.rs
index 49430fd1b13..20bca37d6b9 100644
--- a/components/style/invalidation/element/collector.rs
+++ b/components/style/invalidation/element/collector.rs
@@ -164,6 +164,21 @@ where
             }
         }
 
+        debug!("Collecting changes for: {:?}", element);
+        debug!(" > state: {:?}", state_changes);
+        debug!(
+            " > id changed: {:?} -> +{:?} -{:?}",
+            snapshot.id_changed(),
+            id_added,
+            id_removed
+        );
+        debug!(
+            " > class changed: {:?} -> +{:?} -{:?}",
+            snapshot.class_changed(),
+            classes_added,
+            classes_removed
+        );
+
         let lookup_element =
             if element.implemented_pseudo_element().is_some() {
                 element.pseudo_element_originating_element().unwrap()
diff --git a/components/style/invalidation/element/invalidator.rs b/components/style/invalidation/element/invalidator.rs
index 07b9787de00..62bac3fd8be 100644
--- a/components/style/invalidation/element/invalidator.rs
+++ b/components/style/invalidation/element/invalidator.rs
@@ -241,9 +241,9 @@ where
         );
 
         debug!("Collected invalidations (self: {}): ", invalidated_self);
-        debug!(" > self: {:?}", descendant_invalidations);
-        debug!(" > descendants: {:?}", descendant_invalidations);
-        debug!(" > siblings: {:?}", sibling_invalidations);
+        debug!(" > self: {}, {:?}", self_invalidations.len(), self_invalidations);
+        debug!(" > descendants: {}, {:?}", descendant_invalidations.len(), descendant_invalidations);
+        debug!(" > siblings: {}, {:?}", sibling_invalidations.len(), sibling_invalidations);
 
         let invalidated_self_from_collection = invalidated_self;