Feature-Policy: fullscreen

Feature-Policy: fullscreen

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.

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

Browser compatibility

See also

• Feature-Policy header
• Feature Policy
• Using Feature Policy