Comment by charcircuit
3 years ago
>this feature will track the web pages you visit and generate a list of advertising topics that it will share with web pages whenever they ask
This is factually incorrect. It works like third party cookies, but with privacy. A web page can only retrieve a topic if that site has already observe you visit pages of that topic. In order for you to observe a site that site must send a fetch request to you or embed you in an iframe.
If a random site calls document.browsingTopics() they get no topics as not enough data has been observed by them.