Permissions-Policy: browsing-topics

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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.


Permissions-Policy: browsing-topics=<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 *.


This feature is not part of an official standard, although it is specified in the Topics API Unofficial Proposal Draft.

Browser compatibility

BCD tables only load in the browser

See also