jQuery fadein
by Gregor Z.
HTML
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<div id="clickme">
Click here
</div>
<img id="cat" src="https://fennychandra.files.wordpress.com/2010/11/ninja-cat1.jpg" alt="" width="100" height="123" style="display:none">
JavaScript
$( "#clickme" ).click(function() {
$( "#cat" ).fadeIn( 5000, function() {
console.log("complete");
});
});