from: http://www.w3.org/TR/css3-mediaqueries/
https://css-tricks.com/snippets/css/media-queries-for-standard-devices/
https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries
https://developer.mozilla.org/en-US/docs/Web/CSS/@media?redirectlocale=en-US&redirectslug=CSS%2F%40media
http://www.javascriptkit.com/dhtmltutors/cssmediaqueries.shtml
iPhones
/* ----------- iPhone 4 and 4S ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 320px) and (max-device-width: 480px) and (-webkit-min-device-pixel-ratio: 2) {}/* Portrait */@media only screen and (min-device-width: 320px) and (max-device-width: 480px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: portrait) {}/* Landscape */@media only screen and (min-device-width: 320px) and (max-device-width: 480px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: landscape) {}/* ----------- iPhone 5 and 5S ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 320px) and (max-device-width: 568px) and (-webkit-min-device-pixel-ratio: 2) {}/* Portrait */@media only screen and (min-device-width: 320px) and (max-device-width: 568px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: portrait) {}/* Landscape */@media only screen and (min-device-width: 320px) and (max-device-width: 568px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: landscape) {}/* ----------- iPhone 6 ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (-webkit-min-device-pixel-ratio: 2) { }/* Portrait */@media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: portrait) { }/* Landscape */@media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (-webkit-min-device-pixel-ratio: 2) and (orientation: landscape) { }/* ----------- iPhone 6+ ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (-webkit-min-device-pixel-ratio: 3) { }/* Portrait */@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (-webkit-min-device-pixel-ratio: 3) and (orientation: portrait) { }/* Landscape */@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (-webkit-min-device-pixel-ratio: 3) and (orientation: landscape) { }
Galaxy Phones
/* ----------- Galaxy S3 ----------- *//* Portrait and Landscape */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 2) {}/* Portrait */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape) {}/* ----------- Galaxy S4 ----------- *//* Portrait and Landscape */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) {}/* Portrait */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 320px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape) {}/* ----------- Galaxy S5 ----------- *//* Portrait and Landscape */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) {}/* Portrait */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape) {}
HTC Phones
/* ----------- HTC One ----------- *//* Portrait and Landscape */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) {}/* Portrait */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 360px) and (device-height: 640px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape) {}
Nexus Phones
/* ----------- Nexus 4 ----------- *//* Portrait and Landscape */@media screen and (device-width: 384px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 2) {}/* Portrait */@media screen and (device-width: 384px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 384px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape) {}/* ----------- Nexus 5 ----------- *//* Portrait and Landscape */@media screen and (device-width: 360px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 3) {}/* Portrait */@media screen and (device-width: 360px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 360px) and (device-height: 592px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape) {}
iPads
/* ----------- iPad mini ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (-webkit-min-device-pixel-ratio: 1) {}/* Portrait */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: portrait) and (-webkit-min-device-pixel-ratio: 1) {}/* Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: landscape) and (-webkit-min-device-pixel-ratio: 1) {}/* ----------- iPad 1 and 2 ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (-webkit-min-device-pixel-ratio: 1) {}/* Portrait */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: portrait) and (-webkit-min-device-pixel-ratio: 1) {}/* Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: landscape) and (-webkit-min-device-pixel-ratio: 1) {}/* ----------- iPad 3 and 4 ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (-webkit-min-device-pixel-ratio: 2) {}/* Portrait */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: portrait) and (-webkit-min-device-pixel-ratio: 2) {}/* Landscape */@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (orientation: landscape) and (-webkit-min-device-pixel-ratio: 2) {}
Galaxy Tablets
/* ----------- Galaxy Tab 10.1 ----------- *//* Portrait and Landscape */@media (min-device-width: 800px) and (max-device-width: 1280px) {}/* Portrait */@media (max-device-width: 800px) and (orientation: portrait) { }/* Landscape */@media (max-device-width: 1280px) and (orientation: landscape) { }
Nexus Tablets
/* ----------- Asus Nexus 7 ----------- *//* Portrait and Landscape */@media screen and (device-width: 601px) and (device-height: 906px) and (-webkit-min-device-pixel-ratio: 1.331) and (-webkit-max-device-pixel-ratio: 1.332) {}/* Portrait */@media screen and (device-width: 601px) and (device-height: 906px) and (-webkit-min-device-pixel-ratio: 1.331) and (-webkit-max-device-pixel-ratio: 1.332) and (orientation: portrait) {}/* Landscape */@media screen and (device-width: 601px) and (device-height: 906px) and (-webkit-min-device-pixel-ratio: 1.331) and (-webkit-max-device-pixel-ratio: 1.332) and (orientation: landscape) {}
Kindle Fire
/* ----------- Kindle Fire HD 7" ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 800px) and (max-device-width: 1280px) and (-webkit-min-device-pixel-ratio: 1.5) {}/* Portrait */@media only screen and (min-device-width: 800px) and (max-device-width: 1280px) and (-webkit-min-device-pixel-ratio: 1.5) and (orientation: portrait) {}/* Landscape */@media only screen and (min-device-width: 800px) and (max-device-width: 1280px) and (-webkit-min-device-pixel-ratio: 1.5) and (orientation: landscape) {}/* ----------- Kindle Fire HD 8.9" ----------- *//* Portrait and Landscape */@media only screen and (min-device-width: 1200px) and (max-device-width: 1600px) and (-webkit-min-device-pixel-ratio: 1.5) {}/* Portrait */@media only screen and (min-device-width: 1200px) and (max-device-width: 1600px) and (-webkit-min-device-pixel-ratio: 1.5) and (orientation: portrait) {}/* Landscape */@media only screen and (min-device-width: 1200px) and (max-device-width: 1600px) and (-webkit-min-device-pixel-ratio: 1.5) and (orientation: landscape) {}
Laptops
/* ----------- Non-Retina Screens ----------- */@media screen and (min-device-width: 1200px) and (max-device-width: 1600px) and (-webkit-min-device-pixel-ratio: 1) { }/* ----------- Retina Screens ----------- */@media screen and (min-device-width: 1200px) and (max-device-width: 1600px) and (-webkit-min-device-pixel-ratio: 2) and (min-resolution: 192dpi) { }
Apple Watch
/* ----------- Apple Watch ----------- */@media (max-device-width: 42mm) and (min-device-width: 38mm) { }
Moto 360 Watch
/* ----------- Moto 360 Watch ----------- */@media (max-device-width: 218px) and (max-device-height: 281px) { }
浏览器缓存机制，其实主要就是HTTP协议定义的缓存机制（如： Expires； Cache-control等）。但是也有非HTTP协议定义的缓存机制，如使用HTML Meta 标签，Web开发者可以在HTML页面的节点中加入标签，代码如下：
