@zeh These features are part of official CSSWG resolutions and are ready for other vendors to implement. Sometimes Chrome implements something first, and sometimes Chrome is last. Here, Chrome happens to be first.

The thing with Progressive Enhancement is that you don’t have to care about what works when or where. You put a solid good working base experience in place that works out of the box. But if the browser supports more than just that base, they get a better experience.