<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
body {
font-size: 13px;
}
</style>
<script src="../js/jquery-3.5.1.js"></script>
<script>
$(function () {
$("#btn1").click(function () {
$("div").after(retHtml);
});
function retHtml() {
var str = "<span><b>Write Less Do More</b></span>";
return str;
}
});
</script>
</head>
<body>
<div>jquery</div>
<input type="button" value="after" id="btn1">
</body>
</html>