And in the darkened underpass
I thought oh God, my chance has come at last
(but then a strange fear gripped me and I just couldn’t ask)
The Smiths, “There Is A Light That Never Goes Out”
There is more to Web Accessibility than screen readers and machine readability. One of the more excotic topics there is user preferences via operating system or user generated style sheets. The more commonly known was introduced by Microsoft with Windows 7:
Windows High Contrast Mode (Win HCM).