Initially I tested all browsers from the list,including webkit.
Other browsers decently showed it did not support.
I expected webkit to work as it is chrome, but behaved different then expected.
After some quick tests on my end:
When webkit connects as client to either a firefox, or Chrome: the host (firefox or chrome) shows both players, but on the client there are no players (on webkit), and the webkit client gets booted after short time from the host game.
When the webkit is host it will show both the firefox and chrome players, but the clients show no players (not for firefox or on chrome)
In short: it seems when a connection with the webkit is involved, the host only shows the players.
edit: this is tested on 1 computer, I wonder how much that will make a difference ? (port issues perhaps ?)