messageport-incumbent.html (1304B)
1 <!DOCTYPE html> 2 <meta charset="utf-8"> 3 <title>Making the incumbent page become non-active must not prevent message transmission</title> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 7 <!-- This is the entry global --> 8 9 <iframe src="support/incumbent.html" id="incumbent"></iframe> 10 <iframe src="support/current.html" id="current"></iframe> 11 12 <script> 13 "use strict"; 14 const incumbentIframe = document.querySelector("#incumbent"); 15 const currentIframe = document.querySelector("#current"); 16 17 window.addEventListener("load", () => { 18 promise_test(async () => { 19 // This will invoke the constructor from currentIframe, but with incumbentIframe as the incumbent. 20 const messageChannel = incumbentIframe.contentWindow.createMessageChannel(); 21 22 await new Promise((resolve, reject) => { 23 incumbentIframe.onload = () => resolve(); 24 incumbentIframe.onerror = () => reject(new Error("Could not navigate the iframe")); 25 incumbentIframe.src = "/common/blank.html"; 26 }); 27 28 await new Promise((resolve, reject) => { 29 messageChannel.port1.onmessage = () => resolve(); 30 messageChannel.port1.onmessageerror = () => reject("messageerror event recieved"); 31 messageChannel.port2.postMessage("boo"); 32 }); 33 }); 34 }); 35 </script>