What is the logical order for focus

Like focus, focusin ,focusout is correct? Or first one is the focusin? What order in a chain?

Thanks!

focusin, focus, focusout

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Thanks still you know about
focusin, focus, focusout
combine with
paste, copy, cut

Thanks!

I don’t understand except that a person cuts or copies to the system clipboard then pastes from the clipboard to the document. The person using the browser cuts, copies, and pastes while the full stack programmer sets any value from a file or database.

Is it for textarea tag! So what happens there.