Counting begins at 1 and does not include the page header.

从1开始计数并且不包括在页抬头中。

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Header: the page header shown on the page; not the same as the head element.

header：页面上显示的页眉；与head元素不一样。

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For example, you need to add some links to external resources to the main web page header.

举例来说，你需要在主页面的页眉添加链接，以链接到外部资源。

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He succeeded brilliantly: 114 detailed maps in line with the text, hundreds of margin notes, a header on every page showing time and place, and 11 appendixes that illuminate military, economic and political concepts of the time.

FORBES: Magazine Article