JSFiddle - React, Tailwind, and code Playground

HTML

<SCRIPT Language="JavaScript1.3">
jsver = "1.3";
</SCRIPT>
<SCRIPT Language="JavaScript1.4">
jsver = "1.4";
</SCRIPT>
<SCRIPT Language="JavaScript1.5">
jsver = "1.5";
</SCRIPT>
<SCRIPT Language="JavaScript1.6">
jsver = "1.6";
</SCRIPT>
<SCRIPT Language="JavaScript1.7">
jsver = "1.7";
</SCRIPT>
<SCRIPT Language="JavaScript1.8">
jsver = "1.8";
</SCRIPT>

<BODY>

<SCRIPT LANGUAGE="JavaScript">
document.write("<B>Your browser supports JavaScript version " + jsver + ".</B>")
</SCRIPT>

</body>
</html>