Edit in JSFiddle

Result
JavaScript
HTML

$(document).ready(function () {
                $("#myButton").click(function () {
                    $("<span>This is span element.</span><br/>").insertAfter($('#targetP'));
                });
            });

<html>
        <head>
        <title>insertAfter</title>
        </head>
        <body>
        <p id="targetP">This is p element. On clicking the button span will be added after the p element.</p>
        <input type="button" id="myButton" value="Click ME"/>
        <input type="button" value="Reset" onclick="location.reload()"/>
        </body>
        </html>