Opera 12.10 only adds *partial* support for the Fullscreen API

[simevidas]

According to Opera, version 12.10 implements an older version of the Fullscreen API spec:

Opera 12.10 adds partial support for the Fullscreen API that allows video, games or web pages to use the whole screen to remove distractions like browser chrome that can divert your attention from skateboarding kittens or shooting aliens. (We say "partial" because new "HTML5 the living-on-the-edge standard" specs chop and change. This release implements the Fullscreen API editor's draft 7 February 2012, while the standard has now mutated in the latest July 2012 version.)

Source: http://my.opera.com/ODIN/blog/opera-12-10-is-out

I compared the February 2012 version (implemented by Opera 12.10) with the latest editor’s draft (July 2012). From what I can see, the API stayed the same. However, the :fullscreen-ancestor pseudo-class has been dropped, and a ::backdrop pseudo-element has been added.

I'm not sure though, if this little change is enough to label Opera's implementation "partial" on http://caniuse.com/#feat=fullscreen (current label is "yes").

[Fyrd]

Added as a known issue.