"This is a talk that I’ve given at CityJS this September. I am a principal product manager for developer tools in Microsoft Edge and these are things I encountered during working on the tools, documenting them and going through user feedback."
"I didn’t realize the support for @supports determining selector support was so good! I usually think of @supports as a way to test for property: value pair support. But with the selector() function, we can test for selector support as well."