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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
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 54 | ? | 52 | ? | ? | ? |
atob | Yes | Yes | 1 271 572 | 10 | Yes | Yes |
btoa | Yes | Yes | 1 523 | 10 | Yes | Yes |
caches | 40 | ? | 42 524 | No | ? | No |
clearInterval | 1 | Yes | 1 525 | 4 | 4 | 4 |
clearTimeout | 1 | Yes | 1 526 | 4 | 4 | 4 |
createImageBitmap | 50 | No | 42 527 | No | Yes | No |
fetch | 42 | 14 | 39 348 529 | No | 29 2810 | 10 |
indexedDB | 24 23 webkit | Yes | 16 10 moz 5211 | 10 | 15 | 7 |
isSecureContext | 55 | ? | 52 | ? | ? | ? |
origin | 59 | ? | 54 | No | No | No |
setInterval | 1 | Yes | 1 5212 | 4 | 4 | 1 |
setTimeout | 1 | Yes | 1 5212 | 4 | 4 | 1 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 54 | ? | 52 | ? | ? | ? |
atob | Yes | Yes | ? | 4 271 572 | ? | Yes | ? |
btoa | Yes | Yes | ? | 4 522 | ? | Yes | ? |
caches | Yes | Yes | ? | 42 524 | Yes | Yes | ? |
clearInterval | 1 | 18 | Yes | 4 525 | 6 | 1 | ? |
clearTimeout | 1 | 18 | Yes | 4 526 | 6 | 1 | ? |
createImageBitmap | 50 | 50 | ? | ? | Yes | ? | ? |
fetch | 42 | 42 | 14 | 39 348 529 | ? | 10 | ? |
indexedDB | Yes | ? | Yes | 22 5211 | 22 | 8 | ? |
isSecureContext | 55 | 55 | ? | 52 | ? | ? | ? |
origin | 59 | 59 | ? | 54 | No | No | ? |
setInterval | 1 | 18 | Yes | 4 5212 | 6 | 1 | ? |
setTimeout | 1 | 18 | Yes | 4 5212 | 6 | 1 | ? |
1. atob() ignores all space characters in the argument to comply with the latest HTML5 spec (see bug 711180).
2. atob() now defined on WindowOrWorkerGlobalScope mixin.
3. btoa() now defined on WindowOrWorkerGlobalScope mixin.
4. caches now defined on WindowOrWorkerGlobalScope mixin.
5. clearInterval() now defined on WindowOrWorkerGlobalScope mixin.
6. clearTimeout() now defined on WindowOrWorkerGlobalScope mixin.
7. createImageBitmap() now defined on WindowOrWorkerGlobalScope mixin.
8. From version 34: this feature is behind the dom.fetch.enable preference. To change preferences in Firefox, visit about:config.
9. fetch() now defined on WindowOrWorkerGlobalScope mixin.
10. From version 28: this feature is behind the Experimental Web Platform Features preference.
11. indexedDB now defined on WindowOrWorkerGlobalScope mixin.
12. setInterval now defined on WindowOrWorkerGlobalScope mixin.