diff --git a/src/components/script/dom/range.rs b/src/components/script/dom/range.rs
index 31b6b70671e..3ed02410a1e 100644
--- a/src/components/script/dom/range.rs
+++ b/src/components/script/dom/range.rs
@@ -37,6 +37,10 @@ impl Range {
 }
 
 impl<'a> RangeMethods for JSRef<'a, Range> {
+    /// http://dom.spec.whatwg.org/#dom-range-detach
+    fn Detach(&self) {
+        // This method intentionally left blank.
+    }
 }
 
 impl Reflectable for Range {
diff --git a/src/components/script/dom/webidls/Range.webidl b/src/components/script/dom/webidls/Range.webidl
index c0e8f630546..d74411b1dd9 100644
--- a/src/components/script/dom/webidls/Range.webidl
+++ b/src/components/script/dom/webidls/Range.webidl
@@ -59,7 +59,7 @@ interface Range {
   // void surroundContents(Node newParent);
 
   // Range cloneRange();
-  // void detach();
+  void detach();
 
   // [Throws]
   // boolean isPointInRange(Node node, unsigned long offset);
diff --git a/src/test/wpt/metadata/dom/interfaces.html.ini b/src/test/wpt/metadata/dom/interfaces.html.ini
index 507b00d92de..a5c7e783ce2 100644
--- a/src/test/wpt/metadata/dom/interfaces.html.ini
+++ b/src/test/wpt/metadata/dom/interfaces.html.ini
@@ -1,3 +1,45 @@
 [interfaces.html]
   type: testharness
-  expected: ERROR
+  expected: TIMEOUT
+  [DOMException exception: existence and properties of exception interface prototype object]
+    expected: FAIL
+
+  [DOMException exception: existence and properties of exception interface prototype object\'s "name" property]
+    expected: FAIL
+
+  [DOMError interface: existence and properties of interface object]
+    expected: FAIL
+
+  [DOMError interface object length]
+    expected: FAIL
+
+  [DOMError interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [DOMError interface: existence and properties of interface prototype object\'s "constructor" property]
+    expected: FAIL
+
+  [DOMError interface: attribute name]
+    expected: FAIL
+
+  [DOMError interface: attribute message]
+    expected: FAIL
+
+  [Event interface object length]
+    expected: FAIL
+
+  [Event interface: document.createEvent("Event") must have own property "isTrusted"]
+    expected: FAIL
+
+  [Event interface: new Event("foo") must have own property "isTrusted"]
+    expected: FAIL
+
+  [CustomEvent interface object length]
+    expected: FAIL
+
+  [Event interface: new CustomEvent("foo") must have own property "isTrusted"]
+    expected: FAIL
+
+  [EventTarget interface: existence and properties of interface object]
+    expected: TIMEOUT
+