absolute是相对于最近定位祖先元素，relative相对于自身位置，fixed则相对于浏览器窗口固定定位。 1、 绘制两个方形。 2、 相对 ...

There are two ways that a Web site can set font sizes: relative and absolute. The use of these in various locations on a page will determine not only how fonts and font sizes are computed for the page ...