Feature-Policy: fullscreen

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

The HTTP Feature-Policy header fullscreen directive controls whether the current document is allowed to use Element.requestFullScreen(). When this policy is enabled, the returned Promise rejects with a TypeError.

By default, top-level documents and their same-origin child frames can request and enter fullscreen mode. This directive allows or prevents cross-origin frames from using fullscreen mode. This includes same-origin frames.

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. There was a bug whereby the fullscreen directive didn't work unless the allowfullscreen attribute was also present, but this has been fixed as of Firefox 80 (bug 1608358).

Syntax

Feature-Policy: fullscreen <allowlist>;
<allowlist>

A list of origins for which the feature is allowed. See Feature-Policy.

Default policy

Default allow list for fullscreen is 'self'.

Examples

General example

SecureCorp Inc. wants to disable the Fullscreen API within all browsing contexts except for its own origin and those whose origin is https://example.com. It can do so by delivering the following HTTP response header to define a feature policy:

Feature-Policy: fullscreen 'self' https://example.com

With an <iframe> element

FastCorp Inc. wants to disable fullscreen for all cross-origin child frames, except for a specific <iframe>. It can do so by delivering the following HTTP response header to define a feature policy:

Feature-Policy: fullscreen 'self'

Then include an allow attribute on the <iframe> element:

<iframe src="https://other.com/videoplayer" allow="fullscreen"></iframe>

iframe attributes can selectively enable features in certain frames, and not in others, even if those frames contain documents from the same origin.

Specifications

Specification
Fullscreen API Standard (Fullscreen API)
# permissions-policy-integration

Browser compatibility

BCD tables only load in the browser

See also