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

Result
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