Filter vs find
HTML
<div id="Fruits">
Fruits
<div id="Apple">Apple</div>
<div id="Banana">Banana</div>
</div>
<br/>
<div id="Category">
Category
<div id="Fruits">Fruits</div>
<div id="Animals">Animals</div>
</div>
CSS
div {
border: 1px solid black;
padding:3px;
margin:5px;
}
JavaScript
$('div').filter('#Fruits').css('background','red');
$('div').find('#Fruits').css('border-style','dashed') ;
$('div').has('#Fruits').css('border-style','dotted');