palemoon-dev/platform/layout/reftests/xul/menuitem-key.xul

<?xml version="1.0"?>
<window class="reftest-wait" onload="changeKeys()"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<menuitem id="m1" label="Menu1" key="keyone"/>
<menuitem id="m2" label="Menu2" key="keytwo"/>
<menuitem id="m3" label="Menu3"/>
<menuitem id="m4" label="Menu4"/>
<menuitem id="m5" label="Menu5"/>
<menuitem id="m6" label="Menu6" key="keythree" acceltext="Text"/>
<menuitem id="m7" label="Menu7" key="keythree" acceltext="Text"/>
<menuitem id="m8" label="Menu8" key="keythree" acceltext="Text"/>
<menuitem id="m9" label="Menu9" key="keytwo"/>

<script>
function changeKeys()
{
  document.getElementById("m1").setAttribute("key", "keytwo");
  document.getElementById("m2").removeAttribute("key");
  document.getElementById("m3").setAttribute("key", "keythree");

  document.getElementById("m4").setAttribute("key", "keyone");
  document.getElementById("m4").setAttribute("acceltext", "Text");

  document.getElementById("m5").setAttribute("acceltext", "Text");
  document.getElementById("m5").setAttribute("key", "keytwo");

  document.getElementById("m6").removeAttribute("key");
  document.getElementById("m7").removeAttribute("acceltext");

  document.getElementById("m8").removeAttribute("key");
  document.getElementById("m8").removeAttribute("acceltext");

  document.getElementById("m9").removeAttribute("key");

  document.documentElement.className='';
}
</script>

<keyset>
  <key id="keyone" key="Z" modifiers="control"/>
  <key id="keytwo" key="Y" modifiers="control"/>
  <key id="keythree" key="X" modifiers="accel"/>
</keyset>

</window>