This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The isReload read-only property of the FetchEvent interface returns true if the event was dispatched by the user attempting to reload the page, and false otherwise. Pressing the refresh button is a reload while clicking a link and pressing the back button is not.


var reloaded = FetchEvent.isReload


A Boolean.


self.addEventListener('fetch', function(event) {
    if (event.isReload) {
      //Return something
    } else {
      //Return something else


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4517441 No32 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4545174432 No5.0

1. Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)

See also

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, Sebastianz, kscarfone, jpmedley
Last updated by: fscholz,