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I know they have been around for a long time, for example this 2003 commit has support for them. What was the first...?
The web didn’t exist back then, but some of IBM’s 3270 terminal keyboards had forward and back keys; for example the keyboard provided with the 3279 terminal in 1979 (look at the cursor keys in the bottom right-hand corner):
(Photograph by Dave Fischer; source; CC BY-SA 3.0.)
Required, but never shown