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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.
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic support | Chrome Full support 40 | Edge Full support 17 | Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari No support No | WebView Android Full support 40 | Chrome Android Full support 40 | Edge Mobile No support No | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
frameType | Chrome Full support 43 | Edge Full support 17 | Firefox
Full support
44
| IE No support No | Opera Full support 30 | Safari No support No | WebView Android Full support 43 | Chrome Android Full support 43 | Edge Mobile No support No | Firefox Android Full support 44 | Opera Android Full support 30 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
id | Chrome Full support 40 | Edge ? | Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari No support No | WebView Android Full support 40 | Chrome Android Full support 40 | Edge Mobile ? | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
postMessage | Chrome Full support 45 | Edge ? | Firefox
Full support
44
| IE No support No | Opera Full support 32 | Safari No support No | WebView Android Full support 45 | Chrome Android Full support 45 | Edge Mobile No support No | Firefox Android Full support 44 | Opera Android Full support 32 | Safari iOS No support No | Samsung Internet Android Full support 5.0 |
type | Chrome Full support 60 | Edge ? | Firefox Full support 54 | IE No support No | Opera Full support 47 | Safari No support No | WebView Android Full support 60 | Chrome Android Full support 60 | Edge Mobile ? | Firefox Android Full support 54 | Opera Android Full support 47 | Safari iOS No support No | Samsung Internet Android No support No |
url | Chrome Full support 40 | Edge ? | Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari No support No | WebView Android Full support 40 | Chrome Android Full support 40 | Edge Mobile ? | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
Legend
- Full support
- Full 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.