diff --git a/packages/animations/browser/src/render/web_animations/dom_animation.ts b/packages/animations/browser/src/render/web_animations/dom_animation.ts
index 3004695a9e..f1d825af34 100644
--- a/packages/animations/browser/src/render/web_animations/dom_animation.ts
+++ b/packages/animations/browser/src/render/web_animations/dom_animation.ts
@@ -6,7 +6,15 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-export interface DOMAnimation {
+/**
+ * DOMAnimation represents the Animation Web API.
+ *
+ * It is an external API by the browser, and must thus use "declare interface",
+ * to prevent renaming by Closure Compiler.
+ *
+ * @see https://developer.mozilla.org/de/docs/Web/API/Animation
+ */
+export declare interface DOMAnimation {
   cancel(): void;
   play(): void;
   pause(): void;