多个浏览器对容器宽度实际像素的解释

IE/Opera

对象的实际宽度 = (marg-left) + width + (marg-right)

Firefox/Mozilla

对象的实际宽度= (marg-left) + (border-left-width) + (paddg- left) + width + (paddg-right) + (border-right-width) + (marg-right)