JSFiddle - React, Tailwind, and code Playground

HTML

<img id="image" src="http://farm3.static.flickr.com/2786/4199953283_3eb9def019.jpg" />

CSS

#image {
    visibility: hidden;
}

JavaScript

// set-up an event on the browsers window
window.addEvents({
    
    // be sure to fire the event once the document is fully loaded
    load: function(){
        
        // assing 'singleImage' variable to the image tag with the 'image' ID
        var singleImage = $('image');
        
        // set a bunch of CSS styles to the aforementioned image
        singleImage.set('styles', {
            'opacity': 0,
            'visibility': 'visible'
        });
        
        // fade in the image
        singleImage.set('tween', { duration: 5000 }).fade('in');
    }
});