Permissions-Policy: browsing-topics directive
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.
The HTTP Permissions-Policy header browsing-topics directive controls access to the Topics API.
Where a policy specifically disallows the use of the Topics API, any attempts to call the Document.browsingTopics() method or send a request with a Sec-Browsing-Topics header will fail with a NotAllowedError DOMException.
Syntax
Permissions-Policy: browsing-topics=<allowlist>;
<allowlist>-
A list of origins for which permission is granted to use the feature. See
Permissions-Policy> Syntax for more details.
Default policy
The default allowlist for browsing-topics is *.
Specifications
This feature is not part of an official standard, although it is specified in the Topics API Unofficial Proposal Draft.