diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index d2d37e5c32a..ed53c70ae39 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -90,6 +90,12 @@ malloc_size_of_is_0!(UntrustedNodeAddress);
 #[allow(unsafe_code)]
 unsafe impl Send for UntrustedNodeAddress {}
 
+impl From<style_traits::dom::OpaqueNode> for UntrustedNodeAddress {
+    fn from(o: style_traits::dom::OpaqueNode) -> Self {
+        UntrustedNodeAddress(o.0 as *const c_void)
+    }
+}
+
 impl Serialize for UntrustedNodeAddress {
     fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
         (self.0 as usize).serialize(s)
diff --git a/components/style/dom.rs b/components/style/dom.rs
index 74067e225c8..7629bb11e18 100644
--- a/components/style/dom.rs
+++ b/components/style/dom.rs
@@ -32,26 +32,7 @@ use std::fmt::Debug;
 use std::hash::Hash;
 use std::ops::Deref;
 
-/// An opaque handle to a node, which, unlike UnsafeNode, cannot be transformed
-/// back into a non-opaque representation. The only safe operation that can be
-/// performed on this node is to compare it to another opaque handle or to another
-/// OpaqueNode.
-///
-/// Layout and Graphics use this to safely represent nodes for comparison purposes.
-/// Because the script task's GC does not trace layout, node data cannot be safely stored in layout
-/// data structures. Also, layout code tends to be faster when the DOM is not being accessed, for
-/// locality reasons. Using `OpaqueNode` enforces this invariant.
-#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
-#[cfg_attr(feature = "servo", derive(MallocSizeOf, Deserialize, Serialize))]
-pub struct OpaqueNode(pub usize);
-
-impl OpaqueNode {
-    /// Returns the address of this node, for debugging purposes.
-    #[inline]
-    pub fn id(&self) -> usize {
-        self.0
-    }
-}
+pub use style_traits::dom::OpaqueNode;
 
 /// Simple trait to provide basic information about the type of an element.
 ///
diff --git a/components/style_traits/dom.rs b/components/style_traits/dom.rs
new file mode 100644
index 00000000000..f9844519279
--- /dev/null
+++ b/components/style_traits/dom.rs
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Types used to access the DOM from style calculation.
+
+/// An opaque handle to a node, which, unlike UnsafeNode, cannot be transformed
+/// back into a non-opaque representation. The only safe operation that can be
+/// performed on this node is to compare it to another opaque handle or to another
+/// OpaqueNode.
+///
+/// Layout and Graphics use this to safely represent nodes for comparison purposes.
+/// Because the script task's GC does not trace layout, node data cannot be safely stored in layout
+/// data structures. Also, layout code tends to be faster when the DOM is not being accessed, for
+/// locality reasons. Using `OpaqueNode` enforces this invariant.
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+#[cfg_attr(feature = "servo", derive(MallocSizeOf, Deserialize, Serialize))]
+pub struct OpaqueNode(pub usize);
+
+impl OpaqueNode {
+    /// Returns the address of this node, for debugging purposes.
+    #[inline]
+    pub fn id(&self) -> usize {
+        self.0
+    }
+}
diff --git a/components/style_traits/lib.rs b/components/style_traits/lib.rs
index 3fb17743c13..516e7b6efba 100644
--- a/components/style_traits/lib.rs
+++ b/components/style_traits/lib.rs
@@ -86,6 +86,7 @@ pub enum CSSPixel {}
 //     / desktop_zoom => CSSPixel
 
 pub mod arc_slice;
+pub mod dom;
 pub mod specified_value_info;
 #[macro_use]
 pub mod values;