Observe-Browsing-Topics header
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
Warning: This feature is currently opposed by two browser vendors. See the Standards positions section for details of opposition.
The HTTP Observe-Browsing-Topics response header is used to mark topics of interest inferred from a calling site's URL (i.e., the site where the ad tech