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I'm pretty sure you can still do Fn+up/down/left/right to get PgUp/PgDn/Home/End. They just might not label it anymore. I don't think Apple ever had those keys on laptops. Prior to them adding the Fn key I don't think they even had a way to get them.

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Home/End on macOS have also been C-a/C-e for a very long time thanks to pervasive emacs key bindings throughout most text fields (goes back to NeXT, IIRC)

Cmd+Up/Down/Left/Right, not Fn, so those keybinds have always been accessible, even prior to the Fn key.

I don't think so? Apple's list of shortcuts has Cmd+Up/Down/Left/Right as moving the insertion point for text to the beginning of document/line or end of document or line not Pg Up/Down/Home/End.

https://support.apple.com/en-us/HT201236

That's right. On PCs, Page Up, Page Down, Home and End move the cursor, but on Mac, they only scroll up one page, down one page, to the start, to the end, respectively, without moving the cursor. (Also, the cursor is called the insertion point on Mac.)

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