Edit in JSFiddle

Result
JavaScript
HTML
CSS

$(document).ready(function () {
                $("#myButton").click(function () {
                    $("#targetP").append("<h3>Jquery is easy to learn.</h3>");
                });
            });

<html>
        <head>
        <title>append</title>
        </head>
        <body>
        <p id="targetP">Jquery is amazing.</p><br />
        <input type="button" id="myButton" value="append"/>
        <input type="button" id="reset" value="Reset" onclick="location.reload()" />
        </body>
        </html>

 #targetP
        {
        background-color:Orange;
        }