diff --git a/src/components/script/dom/node.rs b/src/components/script/dom/node.rs
index 9709680300d3..d21c994cb977 100644
--- a/src/components/script/dom/node.rs
+++ b/src/components/script/dom/node.rs
@@ -242,8 +242,11 @@ impl<View> TreeNodeRef<Node<View>> for AbstractNode<View> {
         }
     }
 
-    fn is_root(&self) -> bool {
-        self.parent_node().is_none()
+    fn is_document(&self) -> bool {
+        match self.type_id() {
+            DocumentNodeTypeId(*) => true,
+            _ => false
+        }
     }
 }
 
@@ -327,11 +330,6 @@ impl<'self, View> AbstractNode<View> {
         self.node().next_sibling
     }
 
-    /// Is this node a root?
-    pub fn is_root(self) -> bool {
-        self.parent_node().is_none()
-    }
-
     //
     // Downcasting borrows
     //
@@ -434,13 +432,6 @@ impl<'self, View> AbstractNode<View> {
         self.transmute_mut(f)
     }
 
-    pub fn is_document(self) -> bool {
-        match self.type_id() {
-            DocumentNodeTypeId(*) => true,
-            _ => false
-        }
-    }
-
     // FIXME: This should be doing dynamic borrow checking for safety.
     pub fn with_imm_element<R>(self, f: &fn(&Element) -> R) -> R {
         if !self.is_element() {
diff --git a/src/components/style/selector_matching.rs b/src/components/style/selector_matching.rs
index a4fc7975de19..723119fdeae1 100644
--- a/src/components/style/selector_matching.rs
+++ b/src/components/style/selector_matching.rs
@@ -478,6 +478,8 @@ fn matches_simple_selector<N: TreeNode<T>, T: TreeNodeRefAsElement<N, E>, E: Ele
         }
         FirstChild => matches_first_child(element),
 
+        Root => matches_root(element),
+
         Negation(ref negated) => {
             !negated.iter().all(|s| matches_simple_selector(s, element))
         },
@@ -491,6 +493,15 @@ fn url_is_visited(_url: &str) -> bool {
     false
 }
 
+#[inline]
+fn matches_root<N: TreeNode<T>, T: TreeNodeRefAsElement<N, E>, E: ElementLike>(
+        element: &T) -> bool {
+    match element.node().parent_node() {
+        Some(parent) => parent.is_document(),
+        None => false
+    }
+}
+
 #[inline]
 fn matches_first_child<N: TreeNode<T>, T: TreeNodeRefAsElement<N, E>, E: ElementLike>(
         element: &T) -> bool {
@@ -502,8 +513,14 @@ fn matches_first_child<N: TreeNode<T>, T: TreeNodeRefAsElement<N, E>, E: Element
                 if node.is_element() {
                     return false
                 }
+            },
+            None => match node.node().parent_node() {
+                // Selectors level 3 says :first-child does not match the
+                // root of the document; Warning, level 4 says, for the time
+                // being, the contrary...
+                Some(parent) => return !parent.is_document(),
+                None => return false
             }
-            None => return !element.is_root(),
         }
     }
 }
diff --git a/src/components/style/selectors.rs b/src/components/style/selectors.rs
index ce732068a608..aa7bdb03bca5 100644
--- a/src/components/style/selectors.rs
+++ b/src/components/style/selectors.rs
@@ -64,7 +64,7 @@ pub enum SimpleSelector {
     Visited,
     FirstChild,
 //    Empty,
-//    Root,
+    Root,
 //    Lang(~str),
 //    NthChild(i32, i32),
     // ...
@@ -190,8 +190,9 @@ fn compute_specificity(mut selector: &CompoundSelector,
                 &ClassSelector(*)
                 | &AttrExists(*) | &AttrEqual(*) | &AttrIncludes(*) | &AttrDashMatch(*)
                 | &AttrPrefixMatch(*) | &AttrSubstringMatch(*) | &AttrSuffixMatch(*)
-                | &AnyLink | &Link | &Visited | &FirstChild
-//                | &Empty | &Root | &Lang(*) | &NthChild(*)
+                | &AnyLink | &Link | &Visited
+                | &FirstChild | &Root
+//                | &Empty | &Lang(*) | &NthChild(*)
                 => specificity.class_like_selectors += 1,
                 &NamespaceSelector(*) => (),
                 &Negation(ref negated)
@@ -437,7 +438,7 @@ fn parse_simple_pseudo_class(name: &str) -> Option<SimpleSelector> {
         "link" => Some(Link),
         "visited" => Some(Visited),
         "first-child" => Some(FirstChild),
-//        "root" => Some(Root),
+        "root" => Some(Root),
 //        "empty" => Some(Empty),
         _ => None
     }
diff --git a/src/components/util/tree.rs b/src/components/util/tree.rs
index c84de3495793..7f41dd2958e4 100644
--- a/src/components/util/tree.rs
+++ b/src/components/util/tree.rs
@@ -263,7 +263,7 @@ pub trait TreeNodeRef<Node>: Clone {
 
     fn is_element(&self) -> bool;
 
-    fn is_root(&self) -> bool;
+    fn is_document(&self) -> bool;
 }
 
 pub trait TreeNodeRefAsElement<Node, E: ElementLike>: TreeNodeRef<Node> {
diff --git a/src/test/html/test-css-pseudo-root.html b/src/test/html/test-css-pseudo-root.html
new file mode 100644
index 000000000000..f82349d5ea44
--- /dev/null
+++ b/src/test/html/test-css-pseudo-root.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="content-type" content="application/xhtml+xml; charset=UTF-8" />
+    <link rel="author" title="Daniel Glazman" href="mailto:d.glazman@partner.samsung.com" />
+    <title>:root test</title>
+    <style type="text/css">
+      html:root { background: green; }
+      html      { background: red; }
+      p:root    { background: red; }
+    </style>
+  </head>
+  <body>
+    The background of the page should be green and you should see not red at all.
+    <p>And the background of this sentence should be green too.</p>
+  </body>
+</html>
diff --git a/src/test/ref/basic.list b/src/test/ref/basic.list
index 3a4742786b38..778c344d0e34 100644
--- a/src/test/ref/basic.list
+++ b/src/test/ref/basic.list
@@ -1,3 +1,5 @@
 == basic_width_px.html basic_width_em.html
 == hello_a.html hello_b.html
 == margin_a.html margin_b.html
+== root_pseudo_a.html root_pseudo_b.html
+== first_child_pseudo_a.html first_child_pseudo_b.html
diff --git a/src/test/ref/first_child_pseudo_a.html b/src/test/ref/first_child_pseudo_a.html
new file mode 100644
index 000000000000..467999d711f2
--- /dev/null
+++ b/src/test/ref/first_child_pseudo_a.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>:first-child test</title>
+    <style type="text/css">
+      html:first-child { background: red; }
+      html             { background: yellow;}
+
+      p { width: 20px; height: 20px; background: orange; float: left; margin-left: 10px; }
+      div { clear: both; }
+      #p1, #p2, #p3 { background: red; }
+      #d1 > *:first-child { background: green }
+      #d2 > *:first-child { background: green }
+      #d3 > *:first-child { background: green }
+      #p4 { background: green; }
+      #d4 > *:first-child { background: red }
+    </style>
+  </head>
+  <body>
+    <div id="d1"><p id="p1"> </p><p> </p></div>
+    <div id="d2"> <p id="p2"> </p><p> </p></div>
+    <div id="d3"><!-- comment --><p id="p3"> </p><p> </p></div>
+    <div id="d4"><span> </span><p id="p4"> </p><p> </p></div>
+  </body>
+</html>
diff --git a/src/test/ref/first_child_pseudo_b.html b/src/test/ref/first_child_pseudo_b.html
new file mode 100644
index 000000000000..5ddf44ad4df4
--- /dev/null
+++ b/src/test/ref/first_child_pseudo_b.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>:first-child test</title>
+    <style type="text/css">
+      html             { background: yellow;}
+
+      p { width: 20px; height: 20px; background: orange; float: left; margin-left: 10px; }
+      div { clear: both; }
+      #p1 { background: green; }
+      #p2 { background: green; }
+      #p3 { background: green; }
+      #p4 { background: green; }
+   </style>
+  </head>
+  <body>
+    <div id="d1"><p id="p1"> </p><p> </p></div>
+    <div id="d2"> <p id="p2"> </p><p> </p></div>
+    <div id="d3"><!-- comment --><p id="p3"> </p><p> </p></div>
+    <div id="d4"><span> </span><p id="p4"> </p><p> </p></div>
+  </body>
+</html>
diff --git a/src/test/ref/root_pseudo_a.html b/src/test/ref/root_pseudo_a.html
new file mode 100644
index 000000000000..e54e4ab013a7
--- /dev/null
+++ b/src/test/ref/root_pseudo_a.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>:root test</title>
+    <style type="text/css">
+      html:root { background: green; }
+      html      { background: red; }
+      p:root    { background: red; }
+    </style>
+  </head>
+  <body>
+    The background of the page should be green and you should see not red at all.
+    <p>And the background of this sentence should be green too.</p>
+  </body>
+</html>
diff --git a/src/test/ref/root_pseudo_b.html b/src/test/ref/root_pseudo_b.html
new file mode 100644
index 000000000000..4b6d7a04ffcd
--- /dev/null
+++ b/src/test/ref/root_pseudo_b.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>:root test</title>
+    <style type="text/css">
+      html      { background: green; }
+    </style>
+  </head>
+  <body>
+    The background of the page should be green and you should see not red at all.
+    <p>And the background of this sentence should be green too.</p>
+  </body>
+</html>