Issue 12343: Add pref-gated methods and test for activatable element states

components/script/dom/element.rs

@@ -2087,6 +2087,27 @@ impl ElementMethods for Element {
         // Step 4.
         self.insert_adjacent(position, fragment.upcast()).map(|_| ())
     }
+
+    // check-tidy: no specs after this line
+    fn EnterFormalActivationState(&self) -> ErrorResult {
+        match self.as_maybe_activatable() {
+            Some(a) => {
+                a.enter_formal_activation_state();
+                return Ok(());
+            },
+            None => return Err(Error::NotSupported)
+        }
+    }
+
+    fn ExitFormalActivationState(&self) -> ErrorResult {
+        match self.as_maybe_activatable() {
+            Some(a) => {
+                a.exit_formal_activation_state();
+                return Ok(());
+            },
+            None => return Err(Error::NotSupported)
+        }
+    }
 }
 
 pub fn fragment_affecting_attributes() -> [Atom; 3] {

components/script/dom/webidls/ActivatableElement.webidl

@@ -0,0 +1,15 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+// Interface for testing element activation
+// This interface is entirely internal to Servo, and should not be accessible to
+// web pages.
+[Exposed=(Window,Worker), NoInterfaceObject]
+interface ActivatableElement {
+  [Throws, Pref="dom.testing.element.activation.enabled"]
+  void enterFormalActivationState();
+
+  [Throws, Pref="dom.testing.element.activation.enabled"]
+  void exitFormalActivationState();
+};

components/script/dom/webidls/Element.webidl

@@ -122,3 +122,4 @@ partial interface Element {
 Element implements ChildNode;
 Element implements NonDocumentTypeChildNode;
 Element implements ParentNode;
+Element implements ActivatableElement;