Independent and unrelated to Observatory project, but if anyone is curious to dig deeper into Alexa top ~500K and how it changed over time, take a look at the H

Independent and unrelated to Observatory project, but if anyone is curious to dig deeper into Alexa top ~500K and how it changed over time, take a look at the HTTP Archive dataset. Some examples @ https://discuss.httparchive.org/latest https://discuss.httparchive.org/latest. E.g, to identify sites with CSP: https://discuss.httparchive.org/t/which-sites-have-content-security-policy-to-prevent-xss/589 https://discuss.httparchive.org/t/which-sites-have-content-s.... You can access raw HAR captures, as well as pre-aggregated stats via BigQuery.