Permissions-Policy: language-model directive
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The HTTP Permissions-Policy header language-model directive controls access to the Prompt API.
Specifically, where a defined policy blocks usage, the LanguageModel.availability() static method will return unavailable, and any attempts to call other LanguageModel methods will fail with a NotAllowedError DOMException.
Syntax
Permissions-Policy: language-model=<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 language-model is self. The top-level browsing context and same-origin iframes are allowed access to the Prompt API by default.
Examples
Basic usage
SecureCorp Inc. wants to disallow language-model within all cross-origin iframes except those whose origin is https://example.com. It can do so by delivering the following HTTP response header to define a Permissions Policy:
Permissions-Policy: language-model=(self "https://example.com")
SecureCorp Inc. must also include an allow attribute on each <iframe> element where language-model is to be allowed:
<iframe src="https://example.com/blue" allow="language-model"></iframe>
Note:
Specifying the Permissions-Policy header in this manner disallows language-model for other origins, even if they are allowed by the <iframe> allow attribute.
Using the default policy
If an allowlist for language-model is not defined by a Permissions-Policy response header, user agents will apply the default allowlist self. In this mode, language-model is automatically allowed in the top-level browsing context and same-origin iframes, but not in cross-origin iframes.
To allow language-model in a cross-origin iframe, include an allow attribute on the <iframe> element:
<iframe src="https://other.com/blue" allow="language-model"></iframe>
Specifications
| Specification |
|---|
| Prompt API # permissions-policy |