OOjs UI has still several Opera<12.1 CSS vendor prefixes around. Even MediaWiki browser support matrix states, that Opera version equal and higher than 12.1 are Grade A browsers. VisualEditor Target browser matrix is explicit about not supporting Op < 12 (I guess it should be 12.1 and higher when Opera picked up Blink rendering engine).
Let's clean up and remove them.
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Remove obsolete Opera<12.1 vendor prefixes | oojs/ui | master | +0 -3 |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T113560 Standardize MediaWiki components (tracking) | |||
| Resolved | Volker_E | T116454 Remove Opera<12.1 CSS properties from OOjs UI mixins |
The latest available (before it was stopped) traffic analysis report on browser versions doesn't mention once Opera 11, although older Opera 12 version have several million requests.
I'd go and remove -o-animations, -o-transitions and -o-transforms for now and still let -o-linear-gradient stay, as there's also this picture.
Change 248588 had a related patch set uploaded (by VolkerE):
Remove obsolete Opera<12.1 vendor prefixes
Merged patches related to this:
Last one still pending:
The only remaining -o--prefixed property after that is -o-linear-gradient, used as a hack to give Opera 12 PNG images instead of SVG in some cases, which we're going to keep for now.