Client

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.id Read only
The universally unique identifier of the client as a string.
Client.type Read only
The client's type as a string. It can be "window", "worker", or "sharedworker".
Client.url Read 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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Client
Experimental
Chrome Full support 40Edge Full support 17Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari No support NoWebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS No support NoSamsung Internet Android Full support 4.0
frameType
Experimental
Chrome Full support 43Edge Full support 17Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 30Safari No support NoWebView Android Full support 43Chrome Android Full support 43Firefox Android Full support 44Opera Android Full support 30Safari iOS No support NoSamsung Internet Android Full support 4.0
id
Experimental
Chrome Full support 40Edge Full support ≤79Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari No support NoWebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS No support NoSamsung Internet Android Full support 4.0
postMessage
Experimental
Chrome Full support 45Edge Full support ≤79Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 32Safari No support NoWebView Android Full support 45Chrome Android Full support 45Firefox Android Full support 44Opera Android Full support 32Safari iOS No support NoSamsung Internet Android Full support 5.0
type
Experimental
Chrome Full support 60Edge Full support ≤79Firefox Full support 54IE No support NoOpera Full support 47Safari No support NoWebView Android Full support 60Chrome Android Full support 60Firefox Android Full support 54Opera Android Full support 44Safari iOS No support NoSamsung Internet Android Full support 8.0
url
Experimental
Chrome Full support 40Edge Full support ≤79Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari No support NoWebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS No support NoSamsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.

See also