Hi, I noticed that the emacs from the emacs-xwidget package does not actually provide support for xwidgets. The last commit I could verify it with is 3ee0e4071e8063f6404f8e7c43f175a80f652112 but the problem was also there with version 26.1. You can easily check whether the problem occurs by the build log: Whether xwidget support will be enabled will be printed at the end of the configure script. Emacs will happily build versions without xwidget support even if you specified '--with-xwidgets' on the command line. Maybe we can add a check to the package definition that checks whether the emacs-xwidgets build actually supports xwidgets.
The section `Building Emacs with the '--with-xwidgets' option now requires WebKit2.` from the Emacs 26.2 news indicates that we probably just need to update to WebKit2 to fix the problem. Tim.
