JS timeout example
HTML
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<div id="square">
</div>
CSS
#square{
width: 100px;
height: 100px;
background: red;
}
.highlight{
border: 6px solid yellow
}
JavaScript
$(document).ready(function(){
let el = '#square';
setTimeout(function(){
$(el).addClass('highlight')
},600);
setTimeout(function(){
$(el).removeClass('highlight');
},1000);
});