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diff --git a/components/script/dom/webidls/OffscreenCanvas.webidl b/components/script/dom/webidls/OffscreenCanvas.webidl
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+++ b/components/script/dom/webidls/OffscreenCanvas.webidl
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+/* 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/#the-offscreencanvas-interface
+typedef (OffscreenCanvasRenderingContext2D or WebGLRenderingContext or WebGL2RenderingContext)
+OffscreenRenderingContext;
+
+dictionary ImageEncodeOptions {
+  DOMString type = "image/png";
+  unrestricted double quality = 1.0;
+};
+
+//enum OffscreenRenderingContextId { "2d", "webgl", "webgl2" };
+
+[Exposed=(Window,Worker)/*, Transferable*/, Pref="dom.offscreen_canvas.enabled"]
+interface OffscreenCanvas : EventTarget {
+  [Throws] constructor([EnforceRange] unsigned long long width, [EnforceRange] unsigned long long height);
+  attribute /*[EnforceRange]*/ unsigned long long width;
+  attribute /*[EnforceRange]*/ unsigned long long height;
+
+  OffscreenRenderingContext? getContext(DOMString contextId, optional any options = null);
+  //ImageBitmap transferToImageBitmap();
+  //Promise<Blob> convertToBlob(optional ImageEncodeOptions options);
+};