example.html

<!DOCTYPE html>  
<html>  
<head>  
<title>Output Tag</title>  
</head>  
<body>  
 <p>Calculate the Sum of the two Numbers</p>  
 <form oninput="res.value=parseInt(a.value)+parseInt(b.value);">  
    <label>Enter First Value.</label><br>  
    <input type="number" name="a" value=""/><br>  
    +<br/>  
    <label>Enter First Value.</label><br>   
    <input type="number" name="b" value=""><br>  
    =<br>  
    Output is:<output name="res"></output>  
 </form>  
</body>  
</html>  