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WindowOrWorkerGlobalScope

The WindowOrWorkerGlobalScope mixin describes several features common to the Window and WorkerGlobalScope 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.

Properties

These properties are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope.

WindowOrWorkerGlobalScope.caches Read only: Returns the CacheStorage object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.
WindowOrWorkerGlobalScope.indexedDB Read only: Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory object.
WindowOrWorkerGlobalScope.isSecureContext Read only: Returns a boolean indicating whether the current context is secure (true) or not (false).
WindowOrWorkerGlobalScope.origin Read only: Returns the origin of the global scope, serialized as a string.

Methods

These properties are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope.

WindowOrWorkerGlobalScope.atob(): Decodes a string of data which has been encoded using base-64 encoding.
WindowOrWorkerGlobalScope.btoa(): Creates a base-64 encoded ASCII string from a string of binary data.
WindowOrWorkerGlobalScope.clearInterval(): Cancels the repeated execution set using WindowOrWorkerGlobalScope.setInterval().
WindowOrWorkerGlobalScope.clearTimeout(): Cancels the delayed execution set using WindowOrWorkerGlobalScope.setTimeout().
WindowOrWorkerGlobalScope.createImageBitmap(): Accepts a variety of different image sources, and returns a Promise which resolves to an ImageBitmap. Optionally the source is cropped to the rectangle of pixels originating at (sx, sy) with width sw, and height sh.
WindowOrWorkerGlobalScope.fetch(): Starts the process of fetching a resource from the network.
WindowOrWorkerGlobalScope.setInterval(): Schedules a function to execute every time a given number of milliseconds elapses.
WindowOrWorkerGlobalScope.setTimeout(): Schedules a function to execute in a given amount of time.

Specifications

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 compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	54	?	52	?	?	?
`atob`	Yes	Yes	1 1 27 `atob()` ignores all space characters in the argument to comply with the latest HTML5 spec (see bug 711180). 57 `atob()` now defined on `WindowOrWorkerGlobalScope` mixin.	10	Yes	Yes
`btoa`	Yes	Yes	1 1 52 `btoa()` now defined on `WindowOrWorkerGlobalScope` mixin.	10	Yes	Yes
`caches`	40	?	42 42 52 `caches` now defined on `WindowOrWorkerGlobalScope` mixin.	No	?	No
`clearInterval`	1	Yes	1 1 52 `clearInterval()` now defined on `WindowOrWorkerGlobalScope` mixin.	4	4	4
`clearTimeout`	1	Yes	1 1 52 `clearTimeout()` now defined on `WindowOrWorkerGlobalScope` mixin.	4	4	4
`createImageBitmap`	50	No	42 42 52 `createImageBitmap()` now defined on `WindowOrWorkerGlobalScope` mixin.	No	Yes	No
`fetch`	42	14	39 39 34 Disabled Disabled From version 34: this feature is behind the `dom.fetch.enable` preference. To change preferences in Firefox, visit about:config. 52 `fetch()` now defined on `WindowOrWorkerGlobalScope` mixin.	No	29 29 28 Disabled Disabled From version 28: this feature is behind the `Experimental Web Platform Features` preference.	10
`indexedDB`	24 24 23 Prefixed Prefixed Implemented with the vendor prefix: webkit	Yes	16 16 10 Prefixed Prefixed Implemented with the vendor prefix: moz 52 `indexedDB` now defined on `WindowOrWorkerGlobalScope` mixin.	10	15	7
`isSecureContext`	55	?	52	?	?	?
`origin`	59	?	54	No	No	No
`setInterval`	1	Yes	1 1 52 `setInterval` now defined on `WindowOrWorkerGlobalScope` mixin.	4	4	1
`setTimeout`	1	Yes	1 1 52 `setInterval` now defined on `WindowOrWorkerGlobalScope` mixin.	4	4	1

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	?	54	?	52	?	?	?
`atob`	Yes	Yes	?	4 4 27 `atob()` ignores all space characters in the argument to comply with the latest HTML5 spec (see bug 711180). 57 `atob()` now defined on `WindowOrWorkerGlobalScope` mixin.	?	Yes	?
`btoa`	Yes	Yes	?	4 4 52 `atob()` now defined on `WindowOrWorkerGlobalScope` mixin.	?	Yes	?
`caches`	Yes	Yes	?	42 42 52 `caches` now defined on `WindowOrWorkerGlobalScope` mixin.	Yes	Yes	?
`clearInterval`	1	18	Yes	4 4 52 `clearInterval()` now defined on `WindowOrWorkerGlobalScope` mixin.	6	1	?
`clearTimeout`	1	18	Yes	4 4 52 `clearTimeout()` now defined on `WindowOrWorkerGlobalScope` mixin.	6	1	?
`createImageBitmap`	50	50	?	?	Yes	?	?
`fetch`	42	42	14	39 39 34 Disabled Disabled From version 34: this feature is behind the `dom.fetch.enable` preference. To change preferences in Firefox, visit about:config. 52 `fetch()` now defined on `WindowOrWorkerGlobalScope` mixin.	?	10	?
`indexedDB`	Yes	?	Yes	22 22 52 `indexedDB` now defined on `WindowOrWorkerGlobalScope` mixin.	22	8	?
`isSecureContext`	55	55	?	52	?	?	?
`origin`	59	59	?	54	No	No	?
`setInterval`	1	18	Yes	4 4 52 `setInterval` now defined on `WindowOrWorkerGlobalScope` mixin.	6	1	?
`setTimeout`	1	18	Yes	4 4 52 `setInterval` now defined on `WindowOrWorkerGlobalScope` mixin.	6	1	?

WindowOrWorkerGlobalScope

Properties

Methods

Specifications

Browser compatibilityUpdate compatibility data on GitHub

See also