css - Wondering on how to serve different image backgrounds with media queries (especially for retina displays) -


i'm doing css code website uses full cover background , want serve media queries several devices different resolutions.

i've figured out how iphones , ipads doing this:

@media screen , (min-device-width:320px) , (max-device-width:480px) , (-webkit-min-device-pixel-ratio:1) { /* iphone 2g/3g/3gs */ } @media screen , (min-device-width:640px) , (max-device-width:960px) , (-webkit-min-device-pixel-ratio:2) { /* iphone 4/4s */ } @media screen , (min-device-width:560px) , (max-device-width:1136px) , (-webkit-min-device-pixel-ratio:2) { /* iphone 5 */ } @media screen , (min-device-width:768px) , (max-device-width:1024px) , (-webkit-min-device-pixel-ratio:1) { /* ipad 1/2 , ipad mini */ } @media screen , (min-device-width:1536px) , (max-device-width:2048px) , (-webkit-min-device-pixel-ratio:2) { /* ipad 3/4 */ }

and desktop screens:

@media screen , (min-device-width:1280px), screen , (min-device-width:1366px), screen , (min-device-width:1440px) { /* regular desktop resolutions */ } @media screen , (min-device-width:1680px), screen , (min-device-width:1920px) { /* larger desktop resolutions, hd screens */ }

since purpose of media queries satisfy only full cover background using css rule in each @media (with different images, obviously, reduce server load , display friendly background considering specs between devices)...

html {     background:url("image.jpg") no-repeat center center fixed;     -webkit-background-size:cover;     -moz-background-size:cover;     -o-background-size:cover;     background-size:cover;}

i have doubts doing retina screens (especially macbook pro retina, 13inch , 15inch models).

i guess that, using same logic above, should this:

@media  screen , (min-device-width:2560px) , (min--moz-device-pixel-ratio: 2),  screen , (min-device-width:2560px) , (-o-min-device-pixel-ratio: 2/1),  screen , (min-device-width:2560px) , (-webkit-min-device-pixel-ratio: 2), screen , (min-device-width:2560px) , (min-device-pixel-ratio: 2) { /* 13inch model */ }  @media  screen , (min-device-width:2880px) , (min--moz-device-pixel-ratio: 2),  screen , (min-device-width:2880px) , (-o-min-device-pixel-ratio: 2/1),  screen , (min-device-width:2880px) , (-webkit-min-device-pixel-ratio: 2), screen , (min-device-width:2880px) , (min-device-pixel-ratio: 2) { /* 15inch model */ }

so... hope works in way.

also, give me advice on improving this. main idea each display resolution , device, different image served, avoid overloading both server , client side (in case, browser).

this old, maybe these links help?

css tricks retina display media query

coder wall - hd & retina display media queries


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