Forward and Previous Arrows

I have noticed that there is some inconsistency to the various web online forms with regard to the placement of the Forward / Next and Previous / Back arrows.
Sometimes these are at the top of the scrolled page, sometimes at the bottom and sometimes off to one-side
As a disabled and partially sighted person having consistency of design (UI/UX) is of great help.
Could I please ask for a UI/UX standard to be fully implemented and documented to assist developers.
I am willing to help having a few years in this field, eyes permitting.

Then of course we can move on to ARIA, 508 Compliance, WIA etc, but that’s next week…

Thanks and kind regards,

jB :sunglasses:.