[track-element-src-change-error.html]
  disabled:
    if os == "mac": https://bugzilla.mozilla.org/show_bug.cgi?id=1591638
  [HTMLTrackElement 'src' attribute mutations]
    expected:
      if (os == "win") and (processor == "x86_64") and debug: [PASS, FAIL]
      if (os == "win") and (processor == "x86_64") and not debug: [PASS, FAIL]
      if (os == "win") and (processor == "x86") and not debug: [PASS, FAIL]
      if (os == "win") and (processor == "x86") and debug: [PASS, FAIL]