Wish you could study how websites use CSS?
This is what we do for the CSS chapter of the Web Almanac, for which I'm the content lead this year.
Post your proposals as Github issues and vote on others, here:
or directly in the repo:
https://leaverou.github.io/mavoice/?repo=leaverou/css-almanac&labels=proposed%20stat
https://github.com/LeaVerou/css-almanac