Is it better to animate images or divs? What is the best practice?   When I use doubled retina ready images it is easiest for me to style images than div background images.       Example of my HTML/CSS/GSAP code for e.g. banner ad 300x250 retina ready:     <!DOCTYPE html> <html> <head> <script src=""></script>   <!-- layout -->   <style> body {   margin:0px; } #stage {   position: