[send-response-upload-event-progress.htm]
  disabled:
    if os == "win": https://bugzilla.mozilla.org/show_bug.cgi?id=1373347
  expected:
    if (os == "mac") and debug: ["OK", "TIMEOUT"]
  [XMLHttpRequest: The send() method: Fire a progress event named progress on the XMLHttpRequestUpload (synchronous flag is unset)]
    expected:
      if (os == "mac") and debug: ["PASS", "TIMEOUT"]

