importScripts("mediasource-worker-util.js"); // Note, we do not use testharness.js utilities within the worker context // because it also communicates using postMessage to the main HTML document's // harness, and would confuse the test case message parsing there. onmessage = function(evt) { postMessage({ subject: messageSubject.ERROR, info: "No message expected by Worker"}); }; let util = new MediaSourceWorkerUtil(); postMessage({ subject: messageSubject.OBJECT_URL, info: URL.createObjectURL(util.mediaSource) });