Most sequences used by CLI apps that are supported by popular (widely used) terminal emulators are supported here, i.e. there's good compatibility with VT100/VT220/VT520/etc.

At the moment there's no support for mouse and clipboard - ht uses asciinema's avt for terminal emulation, where this was never needed (although may be added to avt if ht will need it).

Regarding the colors: internally there's full support for standard indexed colors (palette) and RGB. The "getView" call currently returns a plain text version of the screen buffer, stripped of all color information (plaing text is what andyk's headlong project, which uses ht, needs), but we can easily make it return color attributes for each cell or segment of text (either by modifying "getView", or adding complementary "getRichView" or sth like that).