This particular iFrame calls upon a simple JavaScript file, jquery.js (below) that loads a PNG file, dron.png. Gramantik notes that while there was nothing overly odd with the file – it was a ...

Ryan Boudreaux includes all the code snippets you'll need in this demo of how to create an image hover-preview effect using HTML, CSS, and JavaScript.

Even Internet Explorer 7 has gotten in on the PNG transparency act, which means designers can take advantage of sophisticated things like gradients or faded images. But there’s one problem.