1.5), screen and (-o-min-device-pixel-ratio: 3/2), screen and (min-device-pixel-ratio: 1.5), screen and (min-resolution: 144dpi), screen and (min-resolution: 1.5dppx) { /* retina styles here */ }
the desktop version & mobile version • Order them by priority • Compare • If fuzzy do m., otherwise responsive http://www.cennydd.co.uk/2013/the-gradient-chart