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No JavaScript? No Problem.

Sometimes JavaScript isn’t available in your visitor’s web browser. The user might be using assistive technologies or maybe she just disabled JavaScript manually. Whatever the case, the <noscript> tag helps if JavaScript isn’t available in the browser. The <noscript> tag is used by most web browsers when scripting is unavailable. The content between the opening <noscript> and closing </noscript> tags displays for the user, typically informing the user (politely, of course) that JavaScript needs to be enabled in order for the site to function properly.

From

Cover of Microsoft® Start Here!™ Learn JavaScript

Note

<script>
document.write("Hello World!")
</script>
<noscript>Your browser does not support JavaScript!</noscript>