Demo JQuery .append(), .prepend(), .before() dan .after()
HTML
<div id="container">Lorem ipsum dolor sit amet...</div>
CSS
body {
padding:50px;
}
#container {
background-color:yellow;
padding:20px;
}
span {
display:block;
border:2px solid red;
background-color:black;
color:white;
padding:10px 15px;
}
JavaScript
$('#container').wrapInner('<span></span>');