Hello, sorry my bad English. In qupzilla, the input of the Compose key (in versions 2.1.2 and 2.2.2) does not work. In other applications (xterm, firefox, kicad) works. If you copy from them and paste them into qupzilla, then the characters are entered.
In version 2.2.5 doesn't work either.
www-client/qupzilla is dead, long live www-client/falkon.