Did the Srb2 engine introduce FOF?

So, I was playing around in Zandronum loading Srb2 maps (especially final demo zone) when I noticed that bridges, platforms and other things were missing, then I remembered that Zandronum doesn't have FOFs and these objects were broken.
Then I thought to myself "did Srb2 introduced FOFs?" And, here we are.

Well, did Srb2 introduced FOFs or the Doom legacy source port already have these?

FOFs (or 3D floors as they're referred to in the Doom community) were actually introduced for the first time in DOSDoom, the first Doom source port. Apparently, SRB2's Demo 1 (which came out in November 2000) already featured FOFs before Doom Legacy implemented them in December that year, however.

i'm pretty sure zandro does have 3d floors since they're a rather old zdoom feature, you're just not gonna see them in a straight port of an srb2 map because the linedef type numbers aren't 1:1.

Tatsuru said:

FOFs (or 3D floors as they're referred to in the Doom community) were actually introduced for the first time in DOSDoom, the first Doom source port.

Click to expand...

Really? is there a map using it in DOSDoom?