With the popularity of Retina screen, the requirement of the images in the webpages is higher. How to make sure the image still clear while enlarging twice on retina screen? This brings much trouble to web developers, the good news is CSS3 and HTML5 is trying to change this, we can use response image.What is responsive image?It means user agent loads different images according to different resolutions of output devices, it will not waste bandwidth as well. In addition, it can load respective images when the resolution of the device changes.CSS responsive imageiOS developers should be familiar ...