Using WebKit 22.214.171.124 and Epiphany 2.28.1 the OpenStreetMap Wiki is not rendered correctly. It looks like Epiphany is displaying raw gzip instead of decompressing it first.
The Wiki might not be setup correctly but it's working fine in Firefox.
Is this related to #25855?
Yes, looks like it's the same problem, closing this bug as a duplicate.
*** This bug has been marked as a duplicate of bug 25855 ***