<!doctype html> <title>MediaStreamTrack transfer to iframe</title> <script src=/resources/testharness.js></script> <script src=/resources/testharnessreport.js></script> <script> promise_test(async () => { const iframe = document.createElement("iframe"); const stream = await navigator.mediaDevices.getDisplayMedia({audio:true, video: true}); const track = stream.getAudioTracks()[0]; const cloned_track = track.clone(); const result = new Promise((resolve, reject) => { window.onmessage = (e) => { if (e.data.result === 'Failure') { reject('Failed: ' + e.data.error); } else { resolve(); } }; }); iframe.addEventListener("load", () => { assert_not_equals(track.readyState, "ended"); iframe.contentWindow.postMessage(track); assert_equals(track.readyState, "ended"); assert_equals(cloned_track.readyState, "live"); }); iframe.src = "support/iframe-MediaStreamTrack-transfer.html"; document.body.appendChild(iframe); return result; }); </script>