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.
A list of origins for which permission is granted to use the feature. See
Permissions-Policy> Syntax for more details.
The default allowlist for
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 Permissions Policy:
Permissions-Policy: fullscreen=(self "https://example.com")
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 Permissions Policy:
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.
|Fullscreen API Standard |
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