Pagers currently look like this (certain special pages):

(previous 50 | next 50) (20 | 50 | 100 | 250 | 500)

or this (page history):

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)

It's extremely dated, with a lot of visual noise, and needs accessibility improvement with the addition of ARIA attributes.

Tidier layouts would be:

Previous, next. Show [50] items per page.

View: newest, oldest, newer, older. Show [50] revisions per page.

The [50] indicates a drop-down menu. In it the aria-selected attribute should be used on the currently selected quantity.

As a quick improvement to accessibility on the current layout, the link that indicates the currently selected quantity should have the attribute aria-current added to it.