You can't use @supports to feature test for @starting-style. But what we can do, is use another, different property value pair, that is a good proxy for the level of support we need. In this case, I know that @starting-style…

Until recently I had taken only the most cursory look at View Transitions. Now they are in Safari too, and therefore viable across multiple platforms, I wanted to understand them a little more and start making use of them in…