CSS自适应

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CSS3 Media Queries片段
在这里主要分成三类：移动端、PC端以及一些常见的响应式框架的Media Queries片段。
移动端Media Queries片段
iPhone5
@media screen and (device-aspect-ratio: 40/71) {}
或者：
@media screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2){}       
iPhone 5 In Portrait & Landscape
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px){
// CSS Style
}       
iPhone 5 In Landscape
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : landscape){
// CSS Style
}       
iPhone 5 In Portrait
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : portrait){
// CSS Style
}       
iPone4
@media only screen and (-webkit-min-device-pixel-ratio : 1.5), only screen and (min-device-pixel-ratio : 1.5) {}       
iPhone 3G
@media screen and (device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 1){}       
iPhone
/*Landscape*/
@media screen and (max-device-width: 480px) {}

/*Portrait*/
@media screen and (max-device-width: 320px) {}       
Blackberry Torch
@media screen and (max-device-width: 480px) {}       
Samsung S3
@media only screen and (-webkit-device-pixel-ratio: 2) {}       
Google Nexus 7
@media screen and (device-width: 600px) and (device-height: 905px) and (-webkit-min-device-pixel-ratio: 1.331) and (-webkit-max-device-pixel-ratio: 1.332) {}       
Samsung Galaxy S3
@media only screen and (-webkit-device-pixel-ratio: 2) {}       
Samsung Galaxy S2
@media screen and (device-width: 320px) and (device-height: 533px) and (-webkit-device-pixel-ratio: 1.5) {}       
Galaxy Tab 10.1
/*Landscape*/
@media (max-device-width: 1280px) and (orientation: landscape) {}

/*Portrait*/
@media (max-device-width: 800px) and (orientation: portrait) {}       
iPad In Portrait & Landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px){
// CSS Styles
}       
iPad In Landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape){
// CSS Styles
}       
iPad In Portrait
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait){
// CSS Styles
}       
Retina iPad In Portrait & Landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (-webkit-min-device-pixel-ratio: 2){
// CSS Styles
}       
Retina iPad in landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape)
and (-webkit-min-device-pixel-ratio: 2){
// CSS Styles
}       
Retina iPad in portrait
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 2){
// CSS Styles
}       
iPad Mini In Portrait & Landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (-webkit-min-device-pixel-ratio: 1){
// CSS Style
}       
iPad Mini In Landscape
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape)
and (-webkit-min-device-pixel-ratio: 1){
// CSS Style
}       
iPad Mini In Portrait
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 1) {
// CSS Style
}       
桌面端
320px
@media screen and (max-width: 320px) {}       
640px
@media screen and (max-width: 640px) {}       
800px
@media screen and (max-width: 800px) {}       
1024px
@media screen and (max-width: 1024px) {}       
1028px
@media screen and (max-width: 1028px) {}       
除了上面的常见Media Queries片段之外，下面的网站还提供了一些其他的片段：

框架Media Queries片段
Boilerplate
/*URL:http://html5boilerplate.com/*/       
/* Smartphones (portrait and landscape) ----------- */
@media only screen
and (min-width : 320px)
and (max-width : 480px) {
/* Styles */
}
/* Smartphones (landscape) ----------- */
@media only screen
and (min-width : 321px) {
/* Styles */
}
/* Smartphones (portrait) ----------- */
@media only screen
and (max-width : 320px) {
/* Styles */
}
/* iPads (portrait and landscape) ----------- */
@media only screen
and (min-width : 768px)
and (max-width : 1024px) {
/* Styles */
}
/* iPads (landscape) ----------- */
@media only screen
and (min-width : 768px)
and (max-width : 1024px)
and (orientation : landscape) {
/* Styles */
}
/* iPads (portrait) ----------- */
@media only screen
and (min-width : 768px)
and (max-width : 1024px)
and (orientation : portrait) {
/* Styles */
}
/* Desktops and laptops ----------- */
@media only screen
and (min-width : 1224px) {
/* Styles */
}
/* Large screens ----------- */
@media only screen
and (min-width : 1824px) {
/* Styles */
}
/* iPhone 4 ----------- */
@media
only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (min-device-pixel-ratio : 1.5) {
/* Styles */
}       
Bootstrap的Media Queries
/*URL:http://twitter.github.com/bootstrap*/       
/* Large desktop */
@media (min-width: 1200px) { ... }

/* Portrait tablet to landscape and desktop */
@media (min-width: 768px) and (max-width: 979px) { ... }

/* Landscape phone to portrait tablet */
@media (max-width: 767px) { ... }

/* Landscape phones and down */
@media (max-width: 480px) { ... }       
Foundation的Media Queries
/*URL:http://foundation.zurb.com/*/       
/* We use this media query to add styles to any device that supports media queries */
@media only screen { }

/* Used to alter styles for screens at least 768px wide. This is where the grid changes. */
@media only screen and (min-width: 768px) {}

/* Used to alter styles for screens at least 1280px wide. */
@media only screen and (min-width: 1280px) {}

/* Used to alter styles for screens at least 1440px wide. */
@media only screen and (min-width: 1440px) {}

/* Apply styles to screens in landscape orientation */
@media only screen and (orientation: landscape) {}

/* Apply styles to screens in portrait orientation */
@media only screen and (orientation: portrait) {}       
Skeleton的Media Queries
/*URL:http://www.getskeleton.com*/       
/* Smaller than standard 960 (devices and browsers) */
@media only screen and (max-width: 959px) {}

/* Tablet Portrait size to standard 960 (devices and browsers) */
@media only screen and (min-width: 768px) and (max-width: 959px) {}

/* All Mobile Sizes (devices and browser) */
@media only screen and (max-width: 767px) {}

/* Mobile Landscape Size to Tablet Portrait (devices and browsers) */
@media only screen and (min-width: 480px) and (max-width: 767px) {}

/* Mobile Portrait Size to Mobile Landscape Size (devices and browsers) */
@media only screen and (max-width: 479px) {}       
FRAMELESS的Media Queries
/*URL:http://framelessgrid.com/*/
@media screen and (max-width: 16.875em){}
@media screen and (min-width: 32.5em) and (max-width: 37.4375em),       
screen and (min-width: 45em) and (max-width: 56.9375em),       
screen and (min-width: 77.5em) and (max-width: 102.4375em),       
screen and (min-width: 135em){}
@media screen and (min-width: 102.5em) and (max-width: 117.9375em),       
screen and (min-width: 150em){}
@media screen and (min-width: 15em){}
@media screen and (min-width: 30em){}
@media screen and (min-width: 37.5em){}
@media screen and (min-width: 57em){}
@media screen and (min-width: 57em) and (max-width: 117.9375em){}
@media screen and (min-width: 118em){}       
Susy的Media Queries
/*URL:http://susy.oddbird.net/*/
@media (min-width: 29em) {}

@media (min-width: 30em) and (max-width: 60em) {}

@media (min-width: 119em) {}

@media (min-width: 33.75em) and (max-width: 67.5em) {}

@media (min-width: 33.75em) and (max-width: 67.5em) {}       
Less Framework 4
/*URL:http://lessframework.com/*/       
@media only screen and (min-width: 768px) and (max-width: 991px) {}

/*                Mobile Layout: 320px (20em).                */
@media only screen and (max-width: 767px) {}

/*Wide Mobile Layout: 480px (30em)*/
@media only screen and (min-width: 480px) and (max-width: 767px) {}       
Golden Grid System的Media Queries
/*URL:http://goldengridsystem.com/*/
/* @media screen and (min-width: 640px) */
@media screen and (min-width: 40em) {}

/* @media screen and (min-width: 720px) */
@media screen and (min-width: 45em) {}

/* @media screen and (min-width: 888px) */
@media screen and (min-width: 55.5em) {}

/* @media screen and (min-width: 984px) */
@media screen and (min-width: 61.5em) {}

/* @media screen and (min-width: 1200px) */
@media screen and (min-width: 75em) {}

/* @media screen and (min-width: 1392px) */
@media screen and (min-width: 87em) {}

/* @media screen and (min-width: 1680px) */
@media screen and (min-width: 105em) {}

/* @media screen and (min-width: 1872px) */
@media screen and (min-width: 117em) {}

/* @media screen and (min-width: 2080px) */
@media screen and (min-width: 130em) {}       
Fluid baseline的Media Queries
/*URL:http://fluidbaselinegrid.com/*/
/* MOBILE PORTRAIT */
@media only screen and (min-width: 320px) {}

/* MOBILE LANDSCAPE */
@media only screen and (min-width: 480px) {}

/* SMALL TABLET */
@media only screen and (min-width: 600px) {}

/* TABLET/NETBOOK */
@media only screen and (min-width: 768px) {}

/* LANDSCAPE TABLET/NETBOOK/LAPTOP */
@media only screen and (min-width: 1024px) {}

@media only screen and (min-width: 1280px) {}

/* WIDESCREEN */
/* Increased body size for legibility */
@media only screen and (min-width: 1400px) {}       
320andUP
/*URL:http://stuffandnonsense.co.uk/projects/320andup*/
@media only screen and (min-width: 480px) {
  /* 480 */
}

@media only screen and (min-width: 600px) {
  /* 600 */
}

@media only screen and (min-width: 768px) {
  /* 768*/
}

@media only screen and (min-width: 992px) {
  /* 992*/
}

@media only screen and (min-width: 1382px) {
  /* 1382 */

}

@media only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min--moz-device-pixel-ratio: 1.5),
only screen and (min-device-pixel-ratio: 1.5) {
  /* 2x*/
}       
Gridless
/* URL:http://thatcoolguy.github.com/gridless-boilerplate/ */

@media only screen and (min-width: 480px) {
        /* Wide mobile (480px+) styles go here */
}

@media only screen and (min-width: 768px) {
        /* Tablets/netbooks (768px+) styles go here */
}

@media only screen and (min-width: 1024px) {
        /* Desktops (1024px+) styles go here */
}       
TotanTHEMES
/*URL:http://titanthemes.com/*/

/* Smaller than standard 960 (devices and browsers) */
@media only screen and (max-width: 959px) {}

/* Tablet Portrait size to standard 960 (devices and browsers) */
@media only screen and (min-width: 768px) and (max-width: 989px) {}

/* All Mobile Sizes (devices and browser) */
@media only screen and (max-width: 767px) {}

/* Mobile Landscape Size to Tablet Portrait (devices and browsers) */
@media only screen and (min-width: 480px) and (max-width: 767px) {}

/* Mobile Portrait Size to Mobile Landscape Size (devices and browsers) */
@media only screen and (max-width: 479px) {}       
Responsive Grid System
/*URL:http://responsive.gs/*/       
@media (max-width: 480px) {}

@media (min-width: 480px) and (max-width: 768px) {}

@media (min-width: 768px) {}

@media (min-width: 1024px) {}

@media (min-width: 1200px) {}       
本文搜集的是Media Queries在各种设备下的代码片段，希望这些片段能帮大家更好的理解Responsive断点的设置。如果大家有更好的方案，希望能在评论中分享。
2014年04月19日更新
基于视窗宽度的媒体查询断点设置
前提设置body的字体为100%。其具有一个简单的计算公式：100% = 16px = 1em = 14pt
/*Viewport = 1920px*/
@media screen and (max-width: 120em){

}
/*Viewport = 1680px*/
@media screen and (max-width: 105em){

}
/*Viewport = 1400px*/
@media screen and (max-width: 87.5em){

}
/*Viewport = 1200px*/
@media screen and (max-width: 75em){

}
/*Viewport = 1024px*/
@media screen and (max-width: 64em){

}
/*Viewport = 960px*/
@media screen and (max-width: 60em){

}
/*Viewport = 800px*/
@media screen and (max-width : 50em){

}

/*Viewport = 768px*/
@media screen and (max-width : 48em){

}

/*Viewport = 600px*/
@media screen and (max-width: 37.5em){

}

/*Viewport = 480px*/
@media screen and (max-width: 30em){
}

/*Viewport = 320px*/
@media screen and (max-width: 20em){

}

/*Viewport = 240px*/
@media screen and (max-width: 15em){

}


/*
        High Resolution/Retina Display Media Queries
*/
/*Pixel Density 3*/
@media(-webkit-min-device-pixel-ratio: 3),(min-resolution: 192dpi){

}
/*Pixel Density 2*/
@media(-webkit-min-device-pixel-ratio: 2),(min-resolution: 192dpi){

}
/*Pixel Density 1.5*/
@media(-webkit-min-device-pixel-ratio: 1.5),(min-resolution: 124.8dpi){

}
/*Pixel Density 1.25*/
@media(-webkit-min-device-pixel-ratio: 1.25),(min-resolution: 120dpi){

}


/*
        Printed Style Media Queries
*/
/*Print Resolution 300 dpi*/
@media print and (min-resolution: 300dpi){

}

/*Print Resolution 144 dpi*/
@media print and (min-resolution:144dpi){

}

/*Print Resolution 96 dpi*/
@media print and (min-resolution:96dpi){

}

/*Print Resolution 72 dpi*/
@media print and (resolution:72dpi){

}
更新：iPhone6
@media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (orientation : portrait) {
     /*iPhone 6 Portrait*/
}

@media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (orientation : landscape) {
     /*iPhone 6 landscape*/
}

@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (orientation : portrait) {
     /*iPhone 6+ Portrait*/
}

@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (orientation : landscape) {
     /*iPhone 6+ landscape*/
}

@media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px){
     /*iPhone 6 and iPhone 6+ portrait and landscape*/
}

@media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px) and (orientation : portrait){
     /*iPhone 6 and iPhone 6+ portrait*/
}

@media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px) and (orientation : landscape){
     /*iPhone 6 and iPhone 6+ landscape*/
}