Because the DIV object has a editable mode, when we turn that on, all objects in the DIV can be altered.
因为DIV对象有可编辑模式，当我们开启此模式时，DIV中的所有对象都能被改变。
Applying this to the original div element, the contents of the div element would now look like.
将这个函数应用到初始的div元素，div元素的内容就变成下面这样。
Dictate that all pages maintain their content in one of four div elements: a div for the header, one for the footer, one for navigation, and one for content.
指明所有页面在下列四个div元素之一中维护其内容：一个div用于页眉，一个用于页脚，一个用于导航，一个用于内容。
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