UTF-8 HTML calling external JS

Calling external UTF-8 Javascript without charset parameter:

<script language="JavaScript" src="utf8.js"></script>

Expect to see a JS alert with the message "utf-8: àáâãäåæ".

Calling external UTF-8 Javascript with charset parameter:

<script language="JavaScript" src="utf8.js" charset="utf-8"></script>

Expect to see a JS alert with the message "utf-8: àáâãäåæ".

Calling external ISO-Latin1 Javascript with charset parameter:

<script language="JavaScript" src="isolatin1.js" charset="iso-8859-1"></script>

Expect to see a JS alert with the message "iso-8859-1: àáâãäåæ".