HTML/CSS/JS
<!DOCTYPE html>
<html>
   <head>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.min.js"></script>
   </head>
   <body>
<div class="welcome">Welcome To JDoodle.com</div>
   <body>
</html>
<script type="text/javascript">
$(document).ready(function() { $(".welcome").append("!!!"); });
</script>
<style type="text/css">
.welcome { color:green; font-size:36px; font-family:cursive; text-align:center; padding:20px; }
</style>

Result
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