1 files changed, 22 insertions, 0 deletions
diff --git a/components/script/dom/webidls/CustomElementRegistry.webidl b/components/script/dom/webidls/CustomElementRegistry.webidl
new file mode 100644
index 00000000000..1d6f638d67e
--- /dev/null
+++ b/components/script/dom/webidls/CustomElementRegistry.webidl
@@ -0,0 +1,22 @@
+/* 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/. */
+
+// https://html.spec.whatwg.org/multipage/#customelementregistry
+[Exposed=Window, Pref="dom.custom_elements.enabled"]
+interface CustomElementRegistry {
+  [Throws, CEReactions]
+  void define(DOMString name, CustomElementConstructor constructor_, optional ElementDefinitionOptions options = {});
+
+  any get(DOMString name);
+
+  Promise<CustomElementConstructor> whenDefined(DOMString name);
+
+  [CEReactions] void upgrade(Node root);
+};
+
+callback CustomElementConstructor = HTMLElement();
+
+dictionary ElementDefinitionOptions {
+  DOMString extends;
+};