Skipping over pseudo contexts has fixed most of the tests.

src/renderer/walking.rs

@@ -1,4 +1,5 @@
 use crate::renderer::context_element::ContextElement;
+use crate::renderer::context_element::Walkable;
 use crate::renderer::WalkError;
 use std::borrow::Borrow;
 
@@ -34,6 +35,17 @@ where
     WalkResult::FullyWalked(output)
 }
 
+pub fn get_first_non_pseudo_element<'a, B>(breadcrumbs: &'a Vec<B>) -> Option<&B>
+where
+    B: Borrow<dyn ContextElement + 'a>,
+{
+    breadcrumbs
+        .iter()
+        .rev()
+        .filter(|b| !(*b).borrow().is_pseudo_element())
+        .next()
+}
+
 pub fn walk_path<'a, B, P>(
     breadcrumbs: &'a Vec<B>,
     path: &Vec<P>,
@@ -60,17 +72,22 @@ where
         .borrow()
         == "."
     {
-        return match walk_path_from_single_level(
-            breadcrumbs
-                .last()
-                .expect("Breadcrumbs should never be empty"),
-            &path[1..],
-        ) {
-            // If no walking was done at all or we partially walked
-            // then stop trying to find anything because '.' restricts
-            // us to the current scope
-            WalkResult::NoWalk | WalkResult::PartialWalk => Err(WalkError::CantWalk),
-            WalkResult::FullyWalked(new_context) => Ok(new_context),
+        let first_non_pseudo_element = get_first_non_pseudo_element(breadcrumbs);
+        // println!(
+        //     "First non-pseudo element: {:?}",
+        //     first_non_pseudo_element.map(|b| b.borrow())
+        // );
+        return match first_non_pseudo_element {
+            None => Err(WalkError::CantWalk),
+            Some(current_context) => {
+                match walk_path_from_single_level(current_context, &path[1..]) {
+                    // If no walking was done at all or we partially walked
+                    // then stop trying to find anything because '.' restricts
+                    // us to the current scope
+                    WalkResult::NoWalk | WalkResult::PartialWalk => Err(WalkError::CantWalk),
+                    WalkResult::FullyWalked(new_context) => Ok(new_context),
+                }
+            }
         };
     }
     for context in breadcrumbs.iter().rev() {