third_party/WebKit/Source/modules/canvas/offscreencanvas/OffscreenCanvasModule.idl

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// https://html.spec.whatwg.org/multipage/scripting.html#the-offscreencanvas-interface

typedef (OffscreenCanvasRenderingContext2D or
         WebGLRenderingContext or
         WebGL2RenderingContext) OffscreenRenderingContext;
enum OffscreenRenderingContextType { "2d", "webgl", "webgl2" };

[
    ImplementedAs=OffscreenCanvasModule
] partial interface OffscreenCanvas {
    [CallWith=ExecutionContext, RaisesException, RuntimeEnabled=ExperimentalCanvasFeatures] OffscreenRenderingContext? getContext(OffscreenRenderingContextType contextType, optional CanvasContextCreationAttributes attributes);
};