Skipping over pseudo contexts has fixed most of the tests.

src/renderer/iteration_context.rs

@@ -68,6 +68,10 @@ impl Walkable for IterationContext {
             _ => Err(WalkError::CantWalk),
         }
     }
+
+    fn is_pseudo_element(&self) -> bool {
+        true
+    }
 }
 
 impl CompareContextElement for IterationContext {