@zeh As noted in the article the lack of browser support doesn’t really matter here, as it’s a nice progressive enhancement: browsers with no support get the rough switch. Browsers with support (which is Chromium-based ones only at this moment) give you the nice transition.
@bramus it does matter in the sense that it won't be supported, and future adoption is uncertain. No, it won't break anything, but it won't work either. This is not an unreasonable thing to mention.
Lots of new CSS features are about progressive enhancement. This is not different. It's still important for developers to keep in mind what works and when/where, and what doesn't.
The world is not just Chrome/Blink.