for example, if I visit admin/addonmodules.php?module=mycustommodule&action=new_html_template
it will be whole new html (smarty template), you know...
new_html_template.tpl
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<span>{$myVar}</span>
</body>
</html>
how do I do this?