I usually just throw emoji favicon toolkit[1] at this problem and subset to a random rotation of relevant emoji. Client-side-generated and cached favicons are p

I usually just throw emoji favicon toolkit[1] at this problem and subset to a random rotation of relevant emoji. Client-side-generated and cached favicons are possible with canvas and service workers. 1. https://github.com/eligrey/emoji-favicon-toolkit https://github.com/eligrey/emoji-favicon-toolkit