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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.cachesRead only- Returns the
CacheStorageobject associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests. WindowOrWorkerGlobalScope.indexedDBRead only- Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an
IDBFactoryobject. WindowOrWorkerGlobalScope.isSecureContextRead only- Returns a boolean indicating whether the current context is secure (
true) or not (false). WindowOrWorkerGlobalScope.originRead 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
Promisewhich resolves to anImageBitmap. 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. |
| Fetch The definition of 'fetch()' in that specification. |
Living Standard | Definition of the fetch() method. |
| Service Workers The definition of 'caches' in that specification. |
Working Draft | Definition of the caches property. |
| Indexed Database API 2.0 The definition of 'indexedDB' in that specification. |
Recommendation | Definition of the indexedDB property. |
| Secure Contexts The definition of 'isSecureContext' in that specification. |
Candidate Recommendation | Definition of the isSecureContext property. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Chrome Full support 54 | Edge ? | Firefox Full support 52 | IE ? | Opera ? | Safari ? | WebView Android ? | Chrome Android Full support 54 | Edge Mobile ? | Firefox Android Full support 52 | Opera Android ? | Safari iOS ? | Samsung Internet Android ? |
atob | Chrome Full support Yes | Edge Full support Yes | Firefox
Full support
1
| IE Full support 10 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android
Full support
4
| Opera Android ? | Safari iOS Full support Yes | Samsung Internet Android ? |
btoa | Chrome Full support Yes | Edge Full support Yes | Firefox
Full support
1
| IE Full support 10 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android
Full support
4
| Opera Android ? | Safari iOS Full support Yes | Samsung Internet Android ? |
caches | Chrome Full support 40 | Edge ? | Firefox
Full support
42
| IE No support No | Opera ? | Safari No support No | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android
Full support
42
| Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android ? |
clearInterval | Chrome Full support 1 | Edge Full support Yes | Firefox
Full support
1
| IE Full support 4 | Opera Full support 4 | Safari Full support 4 | WebView Android Full support 1 | Chrome Android Full support 18 | Edge Mobile Full support Yes | Firefox Android
Full support
4
| Opera Android Full support 6 | Safari iOS Full support 1 | Samsung Internet Android ? |
clearTimeout | Chrome Full support 1 | Edge Full support Yes | Firefox
Full support
1
| IE Full support 4 | Opera Full support 4 | Safari Full support 4 | WebView Android Full support 1 | Chrome Android Full support 18 | Edge Mobile Full support Yes | Firefox Android
Full support
4
| Opera Android Full support 6 | Safari iOS Full support 1 | Samsung Internet Android ? |
createImageBitmap | Chrome Full support 50 | Edge No support No | Firefox
Full support
42
| IE No support No | Opera Full support Yes | Safari No support No | WebView Android Full support 50 | Chrome Android Full support 50 | Edge Mobile ? | Firefox Android ? | Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android ? |
fetch | Chrome Full support 42 | Edge Full support 14 | Firefox
Full support
39
| IE No support No | Opera
Full support
29
| Safari Full support 10 | WebView Android Full support 42 | Chrome Android Full support 42 | Edge Mobile Full support 14 | Firefox Android
Full support
39
| Opera Android ? | Safari iOS Full support 10 | Samsung Internet Android ? |
indexedDB | Chrome
Full support
24
| Edge Full support Yes | Firefox
Full support
16
| IE Partial support 10 | Opera Full support 15 | Safari Full support 7 | WebView Android Full support Yes | Chrome Android ? | Edge Mobile Full support Yes | Firefox Android
Full support
22
| Opera Android Full support 22 | Safari iOS Full support 8 | Samsung Internet Android ? |
isSecureContext | Chrome Full support 55 | Edge ? | Firefox Full support 52 | IE ? | Opera ? | Safari ? | WebView Android Full support 55 | Chrome Android Full support 55 | Edge Mobile ? | Firefox Android Full support 52 | Opera Android ? | Safari iOS ? | Samsung Internet Android ? |
origin | Chrome Full support 59 | Edge ? | Firefox Full support 54 | IE No support No | Opera No support No | Safari No support No | WebView Android Full support 59 | Chrome Android Full support 59 | Edge Mobile ? | Firefox Android Full support 54 | Opera Android No support No | Safari iOS No support No | Samsung Internet Android ? |
setInterval | Chrome Full support 1 | Edge Full support Yes | Firefox
Full support
1
| IE Full support 4 | Opera Full support 4 | Safari Full support 1 | WebView Android Full support 1 | Chrome Android Full support 18 | Edge Mobile Full support Yes | Firefox Android
Full support
4
| Opera Android Full support 6 | Safari iOS Full support 1 | Samsung Internet Android ? |
setTimeout | Chrome Full support 1 | Edge Full support Yes | Firefox
Full support
1
| IE Full support 4 | Opera Full support 4 | Safari Full support 1 | WebView Android Full support 1 | Chrome Android Full support 18 | Edge Mobile Full support Yes | Firefox Android
Full support
4
| Opera Android Full support 6 | Safari iOS Full support 1 | Samsung Internet Android ? |
Legend
- Full support
- Full support
- Partial support
- Partial support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.