First the XHTML head tag gets closed, and the body tag opened.
首先关闭XHTMLhead标记，打开body标记。
An unclosed HTML document that includes an HTML head tag and the first part of the body tag.
一个未闭合的HTML文档，包含了HTMLhead标签和body标签的第一部分内容。
When this code runs, a new script tag is appended as a child to the current page's head tag.
执行后将在当前页面的head标记中增加一个新的script 标记。
When this code runs, a new script tag is appended as a child to the current page's head tag.
执行后将在当前页面的head标记中增加一个新的script 标记。
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