Opera, along with Mozilla, announced at a CSS Working Group meeting that we would support some
-webkitprefixes. This is because through our site compatibility work, we have experienced that many authors of (especially mobile) sites only use
-webkitprefixed CSS, thereby ignoring other vendor prefixes and not even including an unprefixed equivalent. This leads to a reduced user experience on Opera and Firefox, which don’t receive the same shiny effects such as transitions, gradients and the like, even if the browser supported those effects.
They’ve made some beta (labs) builds of their mobile emulator supporting