[before-prepare-iframe-parse-error-external-classic.html]
  [<script> error: Move parse-error external classic script to iframe before-prepare]
    expected:
      if (os == "linux") and not swgl and not fission and debug: [FAIL, PASS]
      if (os == "linux") and not swgl and not fission and not debug: [PASS, FAIL]
      if (os == "linux") and not swgl and fission and not debug: [PASS, FAIL]
      if (os == "linux") and not swgl and fission and debug: [PASS, FAIL]
      if (os == "linux") and swgl: [PASS, FAIL]
      if (os == "mac") and not debug: [FAIL, PASS]
      if (os == "mac") and debug: [PASS, FAIL]
