JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>
<div></div>
<div></div>

JavaScript

var Site = {
    
    init : function( context ) {
        context = context || 'body';
        
        $(context).find( 'div' ).addStuff();
    }
    
    
};

$.fn.addStuff = function() {
    
    return this.each( function() {
        
        $(this).css({width:'100px',height:'100px',margin:'10px','background-color' : '#00CC00'});        
    });
   
}

Site.init();

// later in the code....
div = $('<div />' )
    $('body').append( div );

div.addStuff().css({
    width: '200px'   
});