Yes, for example Opera 9.27 shows image https://wikimedia.org/api/rest_v1/media/math/render/svg/366e5fad98810346603f2f748934b2b0c3ac61a4 when it pasted in address bar. And it also shows https://wikimedia.org/api/rest_v1/media/math/render/png/366e5fad98810346603f2f748934b2b0c3ac61a4 .

In T137765#2655729, @Izno wrote:

Why are we trying to support v9.27?

Does replacement <img src=...> for <object data=...></object> work on other browsers with HTML5? If yes, why not implement such replacement?

Developer said that problem will be fixed https://en.wikipedia.org/w/index.php?title=User_talk:37.53.235.112&oldid=725919966

How to register here? When I go https://phabricator.wikimedia.org/auth/start/ I see blue button "Login or Register". Why it works only as "Login" (when I choose unique login and password, js shows "Username or password are incorrect.")?