title: Which is faster: toggle display of two divs, or switch background-image?
body: <p>I've got 36 png keyframes which I want to display one by one. I see two generic ways of doing this: have 36 <code>div</code> blocks with different <code>background-image</code> which is toggled by <code>display</code> property, or have single <code>div</code> block and set different <code>background-image</code> on it. I wonder which way is faster.</p>