smashing-ebook-8

The keyboard can also be used to select layers. Pressing Option + [ or
Option + ] selects the layer below or above the current layer, respectively.
Pressing Option + < selects the bottommost layer, and Option + > selects
the uppermost. Option + Shift + < selects all layers between the current
layer and the bottommost layer, and Option + Shift + > selects all layers
between the current and uppermost.