In some Mac documentation the keyboard shortcut for Page Up is fn + up arrow. In other documentation the keyboard shortcut for Page Up is Command + up arrow. Did this change as part of an OS update? And if so, which shortcut is correct for which OS?
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rusty
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Page Up Keyboard Shortcut Change
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It really all depends on the app you are using and what that app supports. An app developer can do anything they want with shortcuts like that.
But for the most part, fn+Up and fn+Down are the equivalent to Page Up and Page Down. They scroll the window by one screen.
Command+Up and Command+Down are usually shortcuts that either take you to the beginning and end of a document, or they move the cursor to the beginning or end of a document. For instance, in Safari when viewing a page, they will take you to the to or bottom of the page. In Pages, they will move the cursor to the top or bottom of the document, which naturally also scrolls the view to the beginning or end since the cursor is there now.
However in Microsoft Word, the Command+Up and Down go by paragraph, which is probably to match how they work on Windows. So you can see it is an app-specific thing.