When I want to try some packages that need xwidgets, I found Arch linux's default Emacs has not Xwidgets support. This is not the only distribution that doesn't include Xwidgets in compiling Emacs. I saw Debian had the same issue before as well.
I compiled Emacs with Xwidgets and it works fine. Does anyone know why this feature is not turned on by default for several distributions? It seems this is due to some problem of webkitgtk before, but webkitgtk is good today. I'm curious why this great feature of Emacs is still not default. (AFAIK, it was introduce in 25.1.)