The origin read-only property of the MessageEvent interface is a USVString representing the origin of the message emitter.


var origin = messageEvent.origin;


A USVString representing the origin.


myWorker.onmessage = function(e) {
  result.textContent =;
  console.log('Message received from worker');


Specification Status Comment
The definition of 'origin' in that specification.
Unknown Initial definition

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
originChrome Full support 1Edge Full support 12Firefox Full support 4IE Full support 9Opera Full support YesSafari Full support 10WebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support 3Samsung Internet Android Full support Yes
Returns USVString (was previously DOMString)Chrome Full support YesEdge ? Firefox Full support 55IE No support NoOpera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support 55Opera Android ? Safari iOS ? Samsung Internet Android ?


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

See also

  • ExtendableMessageEvent — similar to this interface but used in interfaces that needs to give more flexibility to authors.

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