<noscript>You have to load the page with JavaScript disabled to see this message.</noscript>

<noscript>You can see this message as soon as JavaScript is disabled.</noscript>
<script src="instano.js"></script>
<script>
    instano();
</script>

instano({
    reenabledCallback:function(){
        alert("JavaScript is reenabled.");
    }
});

instano.js is currently in Alpha stage. Download the source code on GitHub (development use only).

instano.js uses plain JavaScript and @keyframes CSS animation to disaplay instant messages. There is a fallback to standard <noscript> tags for non-supporting browsers. Since users cannot disable JavaScript in Internet Explorer without a reload, there is no need for this script in IE.

This code started as an answer to the Stack Overflow question "How can a site instantly detect that javascript has been disabled?"

Antony Lau and Zbyszek Tenerowicz. Email for general inquiries.

instano.js is freely distributable under the terms of the MIT license.