diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index d8c23b559d9..3cbe8024b9e 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -1858,6 +1858,11 @@ impl NodeMethods for Node {
         }
     }
 
+    // https://dom.spec.whatwg.org/#dom-node-rootnode
+    fn RootNode(&self) -> Root<Node> {
+        self.inclusive_ancestors().last().unwrap()
+    }
+
     // https://dom.spec.whatwg.org/#dom-node-parentnode
     fn GetParentNode(&self) -> Option<Root<Node>> {
         self.parent_node.get()
diff --git a/components/script/dom/webidls/Node.webidl b/components/script/dom/webidls/Node.webidl
index 871e865e03a..01df71dbdd2 100644
--- a/components/script/dom/webidls/Node.webidl
+++ b/components/script/dom/webidls/Node.webidl
@@ -32,6 +32,8 @@ interface Node : EventTarget {
   [Pure]
   readonly attribute Document? ownerDocument;
   [Pure]
+  readonly attribute Node rootNode;
+  [Pure]
   readonly attribute Node? parentNode;
   [Pure]
   readonly attribute Element? parentElement;
diff --git a/tests/wpt/metadata/dom/interfaces.html.ini b/tests/wpt/metadata/dom/interfaces.html.ini
index 1298cc1e92b..8d92df54e4f 100644
--- a/tests/wpt/metadata/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/dom/interfaces.html.ini
@@ -165,9 +165,6 @@
   [DOMTokenList interface: calling supports(DOMString) on document.body.classList with too few arguments must throw TypeError]
     expected: FAIL
 
-  [Node interface: attribute rootNode]
-    expected: FAIL
-
   [Document interface: new Document() must inherit property "origin" with the proper type (3)]
     expected: FAIL
 
@@ -183,30 +180,6 @@
   [Document interface: calling queryAll(DOMString) on new Document() with too few arguments must throw TypeError]
     expected: FAIL
 
-  [Node interface: new Document() must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: xmlDoc must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: document.createDocumentFragment() must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: document.doctype must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: element must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: document.createTextNode("abc") must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: xmlDoc.createProcessingInstruction("abc", "def") must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
-  [Node interface: document.createComment("abc") must inherit property "rootNode" with the proper type (16)]
-    expected: FAIL
-
   [Element interface: element must inherit property "query" with the proper type (36)]
     expected: FAIL
 
@@ -222,9 +195,6 @@
   [Node interface: new Document() must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: new Document() must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: new Document() must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -234,9 +204,6 @@
   [Node interface: xmlDoc must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: xmlDoc must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: xmlDoc must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -246,9 +213,6 @@
   [Node interface: document.doctype must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: document.doctype must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: document.doctype must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -258,9 +222,6 @@
   [Node interface: document.createDocumentFragment() must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: document.createDocumentFragment() must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: document.createDocumentFragment() must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -321,9 +282,6 @@
   [Node interface: element must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: element must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: element must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -339,9 +297,6 @@
   [Node interface: document.createTextNode("abc") must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: document.createTextNode("abc") must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: document.createTextNode("abc") must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -351,9 +306,6 @@
   [Node interface: xmlDoc.createProcessingInstruction("abc", "def") must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: xmlDoc.createProcessingInstruction("abc", "def") must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: xmlDoc.createProcessingInstruction("abc", "def") must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
@@ -363,9 +315,6 @@
   [Node interface: document.createComment("abc") must inherit property "isConnected" with the proper type (15)]
     expected: FAIL
 
-  [Node interface: document.createComment("abc") must inherit property "rootNode" with the proper type (17)]
-    expected: FAIL
-
   [Node interface: document.createComment("abc") must inherit property "isSameNode" with the proper type (31)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/dom/nodes/rootNode.html.ini b/tests/wpt/metadata/dom/nodes/rootNode.html.ini
deleted file mode 100644
index 8505eb99f81..00000000000
--- a/tests/wpt/metadata/dom/nodes/rootNode.html.ini
+++ /dev/null
@@ -1,15 +0,0 @@
-[rootNode.html]
-  type: testharness
-  bug: https://github.com/servo/servo/issues/10747
-  [rootNode attribute must return the context object when it does not have any parent]
-    expected: FAIL
-
-  [rootNode attribute must return the parent node of the context object when the context object has a single ancestor not in a document]
-    expected: FAIL
-
-  [rootNode attribute must return the document when a node is in document]
-    expected: FAIL
-
-  [rootNode attribute must return a document fragment when a node is in the fragment]
-    expected: FAIL
-