Source
<html>
<head>
<title>Snippet for "Hamming code"</title>
<style>
body { padding: 5px; background-color: lightgoldenrodyellow }
</style>
<script type="text/javascript">
function copy() {
var input = document.getElementById('input');
var output = document.getElementById('output');
output.value = input.value;
}
</script>
</head>
<body>
<h4>Snippet for "Hamming code"</h4>
<input type='text' id='input'></input>
<input type='button' onclick='copy()' value='copy'></input><br>
<input type='text' id='output'></input>
</body>
</html>
Demo