If I do this, it will focus Chromium and open up the print dialog,
i3-msg mark _last, "[class=Chromium] focus", exec xdotool key "Ctrl+P"
If I do this,
i3-msg mark _last, "[class=Chromium] focus", exec xdotool key "Ctrl+P" && sleep 0.5, "[con_mark=foo] _last"
Nothing happens. I'm just wanting to return to the window I marked. Am I doing something wrong?