diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e9634c..dbb642a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@ All notable changes to the `dom_query` crate will be documented in this file.
 
 - Implemented `NodeRef::is_match` and `NodeRef::is` methods, which allow checking if a node matches 
 a given matcher (`&Matcher`) or selector (`&str`) without creating a `Selection` object.
-
+- Implemented `Tree::base_uri`, a quick method that returns the base URI of the document based on the `href` attribute of the `<base>` element. `Document::base_uri` and `NodeRef::base_uri` provide the same functionality. Inspired by [Node: baseURI property]( https://developer.mozilla.org/en-US/docs/Web/API/Node/baseURI).
 
 ### Changed
 
diff --git a/tests/node-traversal.rs b/tests/node-traversal.rs
index 567e9c4..3a9d17a 100644
--- a/tests/node-traversal.rs
+++ b/tests/node-traversal.rs
@@ -261,8 +261,21 @@ fn test_node_base_uri() {
     </html>"#;
     let doc = Document::from(contents);
 
+    // during first call of .base_uri, the result will be cached with OnceCell
+    let base_uri = doc.base_uri().unwrap();
+    assert_eq!(base_uri.as_ref(), "https://www.example.com/");
+
     let sel = doc.select_single("#main");
     let node = sel.nodes().first().unwrap();
+    // using cached result. Access at any node of the tree.
     let base_uri = node.base_uri().unwrap();
     assert_eq!(base_uri.as_ref(), "https://www.example.com/");
 }
+
+
+#[cfg_attr(not(target_arch = "wasm32"), test)]
+#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+fn test_node_base_uri_none() {
+    let doc = Document::from(ANCESTORS_CONTENTS);
+    assert!(doc.base_uri().is_none());
+}
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