<script>
function whichButton(e)
{
document.getElementById("1").innerHTML=e.keyCode;
}
</script>
<body onkeydown="whichButton(event)"><div id="1"></div></body>
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<script>
function whichButton(e)
{
document.getElementById("1").innerHTML=e.keyCode;
}
</script>
<body onkeydown="whichButton(event)"><div id="1"></div></body>