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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The Client interface represents an executable context such as a Worker, or a SharedWorker. Window clients are represented by the more-specific WindowClient. You can get Client/WindowClient objects from methods such as Clients.matchAll() and Clients.get().
Methods
Client.postMessage()- Sends a message to the client.
Properties
Client.idRead only- The universally unique identifier of the client as a string.
Client.typeRead only- The client's type as a string. It can be "
window", "worker", or "sharedworker". Client.urlRead only- The URL of the client as a string.
Specifications
| Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'Client' in that specification. |
Working Draft | Initial definition. |
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.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 40 | ? | 441 | No | 27 | No |
frameType | 43 | ? | 441 | No | 30 | No |
id | 40 | ? | 441 | No | 27 | No |
postMessage | 45 | ? | 441 | No | 32 | No |
type | 60 | ? | 54 | No | 47 | No |
url | 40 | ? | 441 | No | 27 | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 40 | 40 | ? | 44 | 27 | No | 4.0 |
frameType | 43 | 43 | No | 44 | 30 | No | 4.0 |
id | 40 | 40 | ? | 44 | 27 | No | 4.0 |
postMessage | 45 | 45 | No | 44 | 32 | No | 5.0 |
type | 60 | 60 | ? | 54 | 47 | No | No |
url | 40 | 40 | ? | 44 | 27 | No | 4.0 |
1. Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR).