fullscreen directive controls whether the current document is allowed to use
Element.requestFullScreen(). When this policy is enabled, the returned
Promise rejects with a
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.
If both this directive and the
allowfullscreen attribute are present on an
<iframe> element, this directive takes precedence.
Feature-Policy: fullscreen <allowlist>;
The allowlist is a list of origins that takes one of the following values:
*: The feature is allowed by default in top-level browsing contexts and all nested browsing contexts (iframes).
'self': (Default) The feature is allowed by default in top-level browsing contexts and in nested browsing contexts (iframes) in the same domain. The feature is not allowed in cross-origin documents in nested browsing contexts.
'none': The feature is disabled in top-level and nested browsing contexts.
- <origin(s)>: The feature is allowed for specific origins (for example, https://example.com). Origins should be separated by a space.
The valuesThe default value is
*(enable for all origins) or
'none'(disable for all origins) may only be used alone, while
'self'may be used with one or more origins.
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 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.
|Feature Policy||Draft||Initial definition.|
The definition of 'Fullscreen' in that specification.