<picture> <source media="(min-width: 500px)" srcset="http://qnimate.com/wp-content/uploads/2014/06/1024.jpg"> <source sizes="50%" media="(min-width: 200px)" srcset="http://qnimate.com/wp-content/uploads/2014/06/normal-1x.jpg 100w 1x, http://qnimate.com/wp-content/uploads/2014/06/512.jpg"> <img src="http://qnimate.com/wp-content/uploads/2014/06/backup.jpg"> </picture>