JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
</head>
<body style="font-size:62.5%;">
  
<div id="tabs">
    <ul>
    </ul>
</div>
    <input type='button' id='addTab' value='Add Tab'>
    <input type='button' id='appendText' value='Add Text in Tab'>
    
</body>
</html>

SCSS

#addtab{
    cursor:pointer;
}

JavaScript

$(document).ready(function() {
    $("#tabs").tabs({
        tabTemplate: "<li><a href='#{href}'>#{label}</a> <p title='close' id='removeTab' style='cursor:pointer;display:inline'>x</p></li>"
    });
});

$(function() {
    var index = 0;
    $("#addTab").live('click', function() {
        index++;
        var title = 'Tab.....  ' + index;
        var url = '#fragment-' + index;

        addTab(url, title, index);
        //$('li[class=ui-state-default]').id(this)=1; // this line to add id
        $('li.ui-state-default:last').attr('id', 'swapnil' + index)
                alert($('li.ui-state-default:last').attr('id', 'swapnil' + index));
    });

    function addTab(url, title, index) {

        $('#tabs').tabs("add", url, title, [index]);
    }
    $('#removeTab').live('click', function() {
    selected = $('p[id=removeTab]').index(this);
      $('#tabs').tabs("remove", [selected]);
        
    });
    
    
     $('#appendText').live('click', function() {
        $('#tabs .ui-tabs-panel').each(function(index) {
             
             if(!($(this).hasClass('ui-tabs-hide'))){
                 //do the dew!
                 $(this).append("Bla Bla!!!");
                 
             }
        });
    });
    
    
});