Opera 12 vs. 15 comparison on caniuse. <a href="http://caniuse.com/#compare=opera+12.1,opera+15" rel="nofollow">http://caniuse.com/#compare=opera+12.1,opera+15</a><p>I was surprised to see large parts where the 12/15 feature lists are disjoint, which is exciting, as hopefully the v12 features will be ported to 15, and they'd be really strong.<p>As much nostalgia as I have for the Opera of the olden days, of which I was a long time fan, I really like v15, using it now. Once they catch up from the shift I think they're on their way to being the innovation leaders in browser features once again.