Largest num HTML

Largest Num Coding
<html>
<head>
<script>
function largest()
{
var num1, num2, num3;
num1 = Number(document.getElementById("N").value);
num2 = Number(document.getElementById("M").value);
num3 = Number(document.getElementById("O").value);
if(num1>num2 && num1>num3)
{
window.alert(num1+"-is greatest");
}
else if(num2>num1 && num2>num3)
{
window.alert(num2+"-is greatest");
}
else if(num3>num1 && num3>num1)
{
window.alert(num3+"-is greatest");
}
}
</script>
</head>
<body>
<form>
<h1>Calculate largest among three numbers</h1>
<hr color="yellow">
<br>
Enter number 1: <input type="text" id="N"></input><br>
Enter number 2: <input type="text" id="M"></input><br>
Enter number 3: <input type="text" id="O"></input><br>
<hr color="yellow">
<input type="Reset" value="Reset">
<center><button onclick="largest()">OK</button>
</form>
</body>
</html>
Largest Num Output

Calculate largest among three numbers


Enter number 1:
Enter number 2:
Enter number 3:

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