JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" value="clk" onclick="z();"/>
<textarea rows="4" id="text" cols="50">

JavaScript

function z()
{

var z=document.getElementById("text").value;
    var x=z.toLowerCase();
   
 x=x.replace(/\b./g, function(m){ return m.toUpperCase(); });
alert(x);
}