Headers: Permissions-Policy.browsing-topics

Permissions-Policy: browsing-topics directive

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.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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.

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS
`browsing-topics`	115	115	No	101	No	115	No	77	No	23.0	115	No