I have continued to add features to xterm: as of September 2013, it implemented 546 of 556 documented controls as of October 2019, xterm implemented 713 of 723 documented controls. The other programs change far more slowly. As a result they implement a smaller fraction of xterm's repertoire in 2019 than in 2010. Even for cases where they implement a function, it may not work properly (see for exam