LayoutTests/http/wpt/service-workers/about-blank-iframe-worker.js - WebKit - Git at Google

 addEventListener('message', async event => {
     const clients = await self.clients.matchAll({ includeUncontrolled : true });
     clients.forEach(client => client.postMessage(event.data));
 });
	addEventListener('message', async event => {
	const clients = await self.clients.matchAll({ includeUncontrolled : true });
	clients.forEach(client => client.postMessage(event.data));
	});