JSFiddle - React, Tailwind, and code Playground

HTML

<div class="captial">
    this text will be converted to each word having a capital letter in the beginning. a real treat
</div>

<div>
    this text will stay lowercase
</div>

CSS

div{margin:20px;}

JavaScript

$('.captial').each(function(){
    var arr = $(this).text().split(' ');
    var result = "";
    for (var x=0; x<arr.length; x++)
        result+=arr[x].substring(0,1).toUpperCase()+arr[x].substring(1)+' ';
    $(this).text(result.substring(0, result.length-1));
});