client/html/keymap.html
<!DOCTYPE html>
<html lang="en">
<head>
<script language="javascript">
function install() {
// bind keyboard event
window.addEventListener('keydown', function (e) {
document.getElementById('output').innerHTML += e.keyCode + ' : "' + e.code + '", <br>';
e.preventDefault();
return false;
});
}
</script>
</head>
<body onload='install()'>
<p id='output'></p>
</body>
</html>