It adds many exciting convenience layer APIs, including the text navigation API, with which users are able to manipulate the text, image, table features and easily search and replace text content.
As you follow links in the right pane content, you can use the Show in Table of Contents button (top corner of right pane) to display your position in the navigation tree in the left pane.
在右窗格的目录中打开链接，您可以使用Show in Table of Contents按钮(右窗格顶端)来显示您在左侧窗格内导航树中的位置。
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In a Web environment you could disassemble this structure into individual topics and preserve the hierarchy in a generated navigation map or table of contents.