concat.html

<html>
    <head>
        <title> Default HTML</title>
        <script type="text/javascript">
        function addValues(){
           // alert("hello ");
            var a = document.getElementById("t1").value;
            var b = document.getElementById("t2").value;
           
            var c=a+b;
            
            document.getElementById("op").innerHTML="Result = "+c;
        }
        
        </script>


        </head>
        <body>
            
            
                    <input id="t1" type="text" placeholder="text 1"/>
                    <br><br>
                    <input id="t2" type="text" placeholder="text 2"/>
                    <br><br>
            <button onclick="addValues()" id="btnAdd">Add</button>
                    <h2 id="op">Result = </h2>
                
            </body>

    </html>