Summary mode like caniuse.com

[yume-chan]

caniuse.com can show multiple features at the same time (Fyrd/caniuse#2318), and there is a "Feature summary" section at bottom showing the combined data.

For example, opening https://caniuse.com/css-grid,css-container-queries-style shows:

This is useful for documentation because usually a library/app requires multiple APIs to work.