The WindowOrWorkerGlobalScope mixin describes several features common to the Window and WorkerGlobalScope (en-US) interfaces. Each of these interfaces can, of course, add more features in addition to the ones listed below.

Note: WindowOrWorkerGlobalScope is a mixin and not an interface; you can't actually create an object of type WindowOrWorkerGlobalScope.


These properties are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope (en-US).

WindowOrWorkerGlobalScope.caches (en-US) Read only
Returns the CacheStorage (en-US) object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.
WindowOrWorkerGlobalScope.crossOriginIsolated (en-US) Read only
Returns a boolean value that indicates whether a SharedArrayBuffer can be sent via a Window.postMessage() (en-US) call.
WindowOrWorkerGlobalScope.indexedDB (en-US) Read only
Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory (en-US) object.
WindowOrWorkerGlobalScope.isSecureContext (en-US) Read only
Returns a boolean indicating whether the current context is secure (true) or not (false).
WindowOrWorkerGlobalScope.origin (en-US) Read only
Returns the origin of the global scope, serialized as a string.


These methods are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope (en-US).

WindowOrWorkerGlobalScope.atob() (en-US)
Decodes a string of data which has been encoded using base-64 encoding.
Creates a base-64 encoded ASCII string from a string of binary data.
WindowOrWorkerGlobalScope.clearInterval() (en-US)
Cancels the repeated execution set using WindowOrWorkerGlobalScope.setInterval().
WindowOrWorkerGlobalScope.clearTimeout() (en-US)
Cancels the delayed execution set using WindowOrWorkerGlobalScope.setTimeout() (en-US).
WindowOrWorkerGlobalScope.createImageBitmap() (en-US)
Accepts a variety of different image sources, and returns a Promise (en-US) which resolves to an ImageBitmap (en-US). Optionally the source is cropped to the rectangle of pixels originating at (sx, sy) with width sw, and height sh.
WindowOrWorkerGlobalScope.fetch() (en-US)
Starts the process of fetching a resource from the network.
WindowOrWorkerGlobalScope.queueMicrotask() (en-US)
Enqueues a microtask—a short function to be executed after execution of the JavaScript code completes and control isn't being returned to a JavaScript caller, but before handling callbacks and other tasks. This lets your code run without interfering with other, possibly higher priority, code, but before the browser runtime regains control, potentially depending upon the work you need to complete.
Schedules a function to execute every time a given number of milliseconds elapses.
WindowOrWorkerGlobalScope.setTimeout() (en-US)
Schedules a function to execute in a given amount of time.


Specification Status Comment
HTML Living Standard
The definition of 'WindowOrWorkerGlobalScope mixin' in that specification.
Living Standard This is where the main mixin is defined.

Browser compatibility

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See also