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The resultingClientId read-only property of the FetchEvent interface is the id of the client that replaces the previous client during a page navigation.

For example, when navigating from page A to page B resultingClientId is the ID of the client associated with page B.

If the fetch request is a subresource request or the request's destination is report, resultingClientId will be an empty string.


var myResultingClientId = FetchEvent.resultingClientId;


A DOMString.


self.addEventListener('fetch', function(event) {


Specification Status Comment
Service Workers
The definition of 'resultingClientId' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
resultingClientIdChrome Full support 72Edge Full support 18Firefox Full support 65IE No support NoOpera Full support 60Safari No support NoWebView Android Full support 72Chrome Android Full support 72Firefox Android Full support 65Opera Android Full support 50Safari iOS No support NoSamsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also