本文主要包含浏览器,实际像素等相关知识,佚名 希望在学习及工作中可以帮助到您
IE/Opera：
对象的实际宽度 = (margin-left) + width + (margin-right)
Firefox/Mozilla：
对象的实际宽度= (margin-left) + (border-left-width) + (padding- left) + width + (padding-right) + (border-right-width) + (margin-right)
对象的实际宽度 = (margin-left) + width + (margin-right)
Firefox/Mozilla：
对象的实际宽度= (margin-left) + (border-left-width) + (padding- left) + width + (padding-right) + (border-right-width) + (margin-right)