JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="main">
     <div> 
        <p data-Col="notMyVal"> hkjhkjh</p>
        <p data-Col="MyVal"> hkjhkjh</p>
     </div>
     <div  data-Col="MyVAl"> some more text
     </div>        
    </div>
    <div class="main">
        <div  data-Col="myval"> some more text
     </div>        
    </div>
</body>

JavaScript

var searchValue ="myval";

$(".main").find('[data-Col]').filter(function() {
    return $(this).attr('data-Col').toLowerCase() == searchValue.toLowerCase();
}).css("background-color","red");