Edit in JSFiddle

Result
JavaScript
HTML

$(document).ready(function () {
                $("#myButton").click(function () {
                    $("<b>replaceAll() replaces the existing content with new one</b><br/>").replaceAll("p");
                });
            });

<html>
        <head>
        <title>replaceAll</title>
        </head>
        <body>
        <p>This is 20 Fingers and 2 Brains.</p>
        <p>This is demo for replaceAll method.</p>
        <p>Jquery is amazing.</p>
        <input type="button" id="myButton" value="Replace All"/>
        <input type="button" id="reset" value="Reset" onclick="location.reload()" />
        </body>
        </html>