Web前端-Viewport详解

https://developer.mozilla.org/en/docs/Mozilla/Mobile/Viewport_meta_tag

https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariWebContent/UsingtheViewport/UsingtheViewport.html#//apple_ref/doc/uid/TP40006509-SW25

http://www.quirksmode.org/mobile/viewports2.html

http://www.quirksmode.org/mobile/viewports.html

http://www.quirksmode.org/blog/archives/2010/04/a_pixel_is_not.html