JSFiddle - React, Tailwind, and code Playground

HTML

<div id="sample">
</div>

CSS

#sample {
    width:200px;
    height:200px;
    background: #aaa;
}

JavaScript

jQuery.fn.mouseIsOver = function () {
    if($(this[0]).is(":hover"))
    {
        return true;
    }
    return false;
}; 

setInterval(function(){
    var $sample = $("#sample");
    if($sample.mouseIsOver()) {
       $sample.css("background", "yellow");
    }
    else {
       $sample.css("background", "");
    }
}, 200);