Shortcuts do not work on the dope sheet. (2.8version) I am using version 2.8 of Blender. 

The following shortcuts do not work on the dope sheet. 

Is there a solution?

Ctrl + Shift → : next marker

Ctrl + Shift ← : previous marker

Shift + ↑ 10 : frames forward

Shift + ↓ 10 : frames back
Try Alt + mouse scroller

PS: I'm trying to fix my screencast keys but I was pressing Alt + mouse scroller