Webstorm MAC OSX: Shortcut to move caret to page bottom or top with selection

Question

In Webstorm MAC OSX, shortcut to Move Caret to Page Bottom/Top with Selection is Shift + Command + Down/Top Arrow with an equal sign.

Please let me know where I can find the key in bold or how to use this shortcut?

Here is an image to show how it looks:

Answer 1

Those are page-up and page-down keys.

From source:

Page up - Smaller keyboards need to do Fn-Up Arrow to get page up.
Page Down - Smaller keyboards need to do Fn-Dwn Arrow to get page up.

Source