diff --git a/kayle_innate/Cargo.lock b/kayle_innate/Cargo.lock
index 0c9ebe6..f9d610c 100644
--- a/kayle_innate/Cargo.lock
+++ b/kayle_innate/Cargo.lock
@@ -238,6 +238,7 @@ dependencies = [
  "case_insensitive_string",
  "console_error_panic_hook",
  "cssparser",
+ "ego-tree",
  "getrandom",
  "js-sys",
  "lazy_static",
diff --git a/kayle_innate/Cargo.toml b/kayle_innate/Cargo.toml
index b9f4395..c0dbc50 100644
--- a/kayle_innate/Cargo.toml
+++ b/kayle_innate/Cargo.toml
@@ -29,6 +29,7 @@ serde-wasm-bindgen = "0.4"
 js-sys = "0.3.64"
 selectors = "0.25.0"
 smallvec = "1.11.1"
+ego-tree = "0.6.2"
 
 [dependencies.cssparser]
 version = "^0.31.0"
diff --git a/kayle_innate/src/engine/audit/wcag.rs b/kayle_innate/src/engine/audit/wcag.rs
index 65e729f..b5de802 100644
--- a/kayle_innate/src/engine/audit/wcag.rs
+++ b/kayle_innate/src/engine/audit/wcag.rs
@@ -12,7 +12,7 @@ impl WCAG3AA {
     /// init the rules
     pub fn audit(
         // allow tree mutation until threads or setup the tree with initial elements.
-        tree: std::collections::BTreeMap<&str, Vec<ElementRef<'_>>>,
+        tree: &std::collections::BTreeMap<&str, Vec<ElementRef<'_>>>,
         _css: cssparser::Parser<'_, '_>,
         // todo: get configs like viewport
     ) -> Vec<Issue> {
diff --git a/kayle_innate/src/lib.rs b/kayle_innate/src/lib.rs
index 03ede58..8969863 100644
--- a/kayle_innate/src/lib.rs
+++ b/kayle_innate/src/lib.rs
@@ -18,6 +18,9 @@ use std::collections::BTreeMap;
 use std::collections::HashSet;
 use utils::{convert_abs_path, convert_base_path, domain_name, set_panic_hook};
 
+#[cfg(feature = "accessibility")]
+use selectors::matching::{MatchingContext, MatchingMode, QuirksMode};
+
 #[cfg(feature = "accessibility")]
 #[wasm_bindgen]
 extern "C" {
@@ -231,6 +234,8 @@ pub fn parse_accessibility_tree(
 /// audit a web page passing the html and css rules.
 pub fn _audit_not_ready(html: &str, _css_rules: &str) -> Result<JsValue, JsValue> {
     // majority of time is spent on initial parse_document.
+
+    use selectors::NthIndexCache;
     let html = scraper::Html::parse_document(html);
     let _tree = parse_accessibility_tree(&html);
     // TODO: if the css rules are empty extract the css from the HTML
@@ -244,7 +249,7 @@ pub fn _audit_not_ready(html: &str, _css_rules: &str) -> Result<JsValue, JsValue
 
     let mut rules = Vec::new();
 
-    // todo: parse the rules out correctly to nodes and add declarations 
+    // todo: parse the rules out correctly to nodes and add declarations
     for result in css_rules_parser {
         match result {
             Ok(crate::engine::styles::rules::CssRule::StyleRule { selectors, block }) => {
@@ -252,13 +257,45 @@ pub fn _audit_not_ready(html: &str, _css_rules: &str) -> Result<JsValue, JsValue
                     rules.push((selector, block.clone()));
                 }
             }
-            _ => ()
+            _ => (),
         };
     }
 
     console_log!("CSS RULES: {:?}", rules);
 
-    let _audit = engine::audit::wcag::WCAG3AA::audit(_tree, _css_parser);
+    let _audit = engine::audit::wcag::WCAG3AA::audit(&_tree, _css_parser);
+
+    // TODO: build struct that can keep lifetimes
+    // let mut nth_index_cache = NthIndexCache::from(Default::default());
+    // let mut match_context = MatchingContext::new(
+    //     MatchingMode::Normal,
+    //     None,
+    //     &mut nth_index_cache,
+    //     QuirksMode::NoQuirks,
+    //     selectors::matching::NeedsSelectorFlags::No,
+    //     selectors::matching::IgnoreNthChildForInvalidation::No,
+    // );
+
+    // for item in _tree {
+    //     for node in item.1 {
+    //         let id = node.id();
+
+    //         // todo: use the css block style to get computations
+    //         for &(ref selector, ref _block) in &rules {
+    //             if selectors::matching::matches_selector(
+    //                 selector,
+    //                 0,
+    //                 None,
+    //                 &node,
+    //                 &mut match_context,
+    //             ) {
+    //                 console_log!("Style Match {:?}", id);
+    //                 // build all the styles for the element based on the match
+    //                 // into.push(_block)
+    //             }
+    //         }
+    //     }
+    // }
 
     // todo: map to JsValues instead of serde
     Ok(serde_wasm_bindgen::to_value(&_audit)?)