As a Lua user and a big fan of Qute et al browsers, I really want to like Luakit, but they've had a video bug[1] (they don't work at all) for a long time, and basically just ignore the issue as "not our bug" because it's apparently a webkit bug.
Well it is a Webkit bug. Epiphany/Gnome Web has the same issue. All they could do is either fix whats been broken in the Gtk port of Webkit for years or to start from scratch and use Chromium instead. Neither option is one that a small developer can easily do.