Notebooks are a type of widget that lets apps show one of multiple pages (also colloquially referenced as "tab bars").

Static Notebook

A Static Notebook is a small set of unchanging tabs, commonly seen in preferences or settings screens. The tabs appear as linked buttons centered at the top of the content area. A Static Notebook should typically contain two to five tabs.

Dynamic Notebook

A Dynamic Notebook is a way for an app to provide user-manageable tabbing functionality, commonly seen in web browsers. The tabs appear attached to the toolbar on their own tab bar above the relevant content. Tabs are able to be rearranged and closed, and a "new tab" button is at the start of the notebook widget.

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