If the browser supports scripting, it does not display the text in the NoScript element.
Browsers that do not recognize <script> label will display the contents of the label on the page. To prevent the browser from doing so, you should hide the script in the comment label. Older (unrecognized &script> tagged) browsers ignore annotations, so they don't write the contents of the tags on the page, and newer browsers know how to execute them, even if they are surrounded in the comment tags!
Instance Code
<body>
<script type= "Text/javascript" >
<!--
Alert ("Welcome to http://www.html5cn.org/!");
-->
</script>
<noscript> If you see these words, your browser does not support javascript</noscript>
</body>
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