JSFiddle - React, Tailwind, and code Playground

by Dineshkani

HTML

<div id="firstdiv" class="sample">
    <div>Hello Jquery</div>
    <div class="simple">Welcome to Tutorial</div>
    <div>Hello World</div>
    <div>Ends</div>
</div>


<input type="button" value="Has Class" />

CSS

.sample{
    background-color: white;
    height: 140px;
}

.foo{
    background-color: yellow;
}

JavaScript

$("input").click(function(){
    $("#firstdiv").has(".simple").addClass("foo");
});