xterm can do inline graphics too, in the form of Sixel for raster graphics and ReGIS for vector graphics. At least those are sort of standard, in that they were used by real terminals and there are real specs for them.
The annoying thing is, even if terminals standardized on one protocol, none of them set $TERM or use terminfo properly. So there's no good way for programs to actually use these features, because you don't know if you're running in a terminal that supports them, or which escape codes to send to make use of them.
The annoying thing is, even if terminals standardized on one protocol, none of them set $TERM or use terminfo properly. So there's no good way for programs to actually use these features, because you don't know if you're running in a terminal that supports them, or which escape codes to send to make use of them.