CSS:
1.
<link type=text/css href=<%=ResolveUrl(~/css/css.css)%> rel=stylesheet/> asp.net relative server path
<link type=text/css href=/css/css.css rel=stylesheet/>
2.
<style type=text/css>
.txtClass {
font-size: 12px;
}
</syle>
JS: Tags cannot be abbreviated, they must be <script></script>
1.
<script type=text/javascript src=<%=ResolveUrl(~/js/jquery-1.4.2.mini.js)%> >/script> asp.net relative server path
<script type=text/javascript src=/js/jquery-1.4.2.mini.js >/script>
2.
<script language=javascript type=text/javascript>
function check_up_message(text)
{
}
</script>