<h1 id="default_message" style="position: absolute; top:45%">
  Plug in ethernet | 插上网路线开始测试
</h1>
<h1 id="message" style="position: absolute; top:55%">
</h1>
<br>
<div onClick="toggleFAUtility()">Click to toggle FA utility:</div>
<div id="fa-utility" style="display: none">
  <input type="radio" id="loop_0"
      onClick="testCommand('loop_0')">
    No audio looping
  <br>
  <input type="radio" id="loop_1"
      onClick="testCommand('loop_1')">
    Loop from digital mic to headphone out
  <br>
  <input type="radio" id="loop_2"
      onClick="testCommand('loop_2')">
    Loop from headphone in to speaker
  <br>
  <input type="radio" id="loop_3"
      onClick="testCommand('loop_3')">
    Loop from headphone in to headphone out
  <br>
  <input type="radio" id="xtalk_l"
      onClick="testCommand('xtalk_l')">
    Mute headphone left channel while playing tone
  <br>
  <input type="radio" id="xtalk_r"
      onClick="testCommand('xtalk_r')">
    Mute headphone right channel while playing tone
  <br>
  <input type="radio" id="multitone"
      onClick="testCommand('multitone')">
    Play multitone
  <br>
  <input type="radio" id="sweep"
      onClick="testCommand('sweep')">
    Play sweep
  <br>
  <input type="button" onClick="restore()" value="Restore"/>
</div>