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。
Think of a combo box that has two choices, one that hides the div and that one shows the div.
比如一个具有两个选项的组合框，一个选项是隐藏 div，一个选项是显示此 div。
Using spans here is probably a bit excessive; all the text within the title div will be hidden, as will all the text in the slogan div.
在这里使用span可能有点多余；所有在标题div内的文本将被隐藏，以及所有在标语div内的文本也一样。
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