There is no complete spec, especially for interactions which only exist in software terminals. I've been through this myself (https://github.com/duskwuff/fvterm

There is no complete spec, especially for interactions which only exist in software terminals. I've been through this myself (https://github.com/duskwuff/fvterm https://github.com/duskwuff/fvterm). That being said: > for example: CSI n S (Scroll Up), should that insert empty lines at the bottom (ie scrolling the content up) or scroll back through the buffer? As a general rule, nothing interacts with scrollback. CSI S inserts empty lines at the bottom of the screen and deletes lines from the top; conversely, CSI T inserts empty lines at the top and deletes from the bottom. Which operations should touch the scrollback is debatable. My inclination is to only append to scrollback when scrolling occurs "naturally" as the result of a newline or wrap, and neither DECSTBM nor the alternate screen are active at the time. (DECSTBM and alt-screen tend to indicate that a full-screen application is running, so saving rows to scrollback is unlikely to be meaningful.)