Permissions-Policy: fullscreen directive
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The HTTP Permissions-Policy header fullscreen directive controls whether the current document is allowed to use Element.requestFullscreen().
Specifically, where a defined policy blocks use of this feature, requestFullscreen() calls will return a Promise that rejects with a TypeError.
Note:
If both this directive (i.e., via the allow attribute) and the allowfullscreen attribute are present on an <iframe> element, this directive takes precedence.
Syntax
Permissions-Policy: fullscreen=<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 fullscreen is self. The top-level browsing context and same-origin iframes are allowed access to the fullscreen feature by default.
Examples
Basic usage
SecureCorp Inc. wants to disallow fullscreen 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: fullscreen=(self "https://example.com")
SecureCorp Inc. must also include an allow attribute on each <iframe> element where fullscreen is to be allowed:
<iframe src="https://example.com/presentation" allow="fullscreen"></iframe>
Note:
Specifying the Permissions-Policy header in this manner disallows fullscreen for other origins, even if they are allowed by the <iframe> allow attribute.
Using the default policy
If an allowlist for fullscreen is not defined by a Permissions-Policy response header, user agents will apply the default allowlist self. In this mode, fullscreen is automatically allowed in the top-level browsing context and same-origin iframes, but not in cross-origin iframes.
To allow fullscreen in a cross-origin iframe, include an allow attribute on the <iframe> element:
<iframe src="https://other.com/videoplayer" allow="fullscreen"></iframe>
Specifications
| Specification |
|---|
| Fullscreen API # permissions-policy-integration |