1<!doctype html> 2<title>This tab will have its connection observed</title> 3<script> 4'use strict'; 5 6let protocol = location.protocol.replace('http', 'ws'); 7let url = protocol + '//' + location.host + '/close-observer?role=observed'; 8 9window.ws = new WebSocket(url); 10ws.onopen = () => { 11 document.title = 'CONNECTED'; 12 ws.onclose = null; 13}; 14ws.onclose = () => { 15 document.title = 'CLOSED'; 16}; 17 18// Leave the connection open. 19</script> 20