To do Alt + H A B on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, A, B.
Command: Align Bottom
This is how to do Alt + H A B on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + H A B positions cell contents at the bottom of the cell. This is useful when you have rows of varying height and want text to line up at the bottom.