chromium/src/third_party/blink/web_tests/timezonechange/resources/shared-worker-timezonechange.js - manifest_repos/chromium_src - Git at Google

 onconnect = connectEvent => {
   const port = connectEvent.ports[0];
   ontimezonechange = () => port.postMessage("SUCCESS");
   port.postMessage("READY");  // (the html will change the timezone)
 }
	onconnect = connectEvent => {
	const port = connectEvent.ports[0];
	ontimezonechange = () => port.postMessage("SUCCESS");
	port.postMessage("READY"); // (the html will change the timezone)
	}