JSFiddle - React, Tailwind, and code Playground

HTML

<input id="tx-in" placeholder="placeholder value" type="text">

CSS

::-webkit-input-placeholder { 
    color: red; 
}


.blue-pl::-webkit-input-placeholder {
    color: blue; 
}

JavaScript

$('#tx-in').click(function() {
    $(this).addClass('blue-pl');
});