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.replace(/\b./g, function(m){ return m.toUpperCase(); });
alert(x);
}