Feature-Policy: encrypted-media

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

The HTTP Feature-Policy header encrypted-media directive controls whether the current document is allowed to use the Encrypted Media Extensions API (EME). When this policy is enabled, the Promise returned by Navigator.requestMediaKeySystemAccess() will reject with a DOMException.

Syntax

Feature-Policy: encrypted-media <allowlist>;
<allowlist>

An allowlist is a list of origins that takes one or more of the following values, separated by spaces:

  • *: The feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin.
  • 'self': The feature will be allowed in this document, and in all nested browsing contexts (iframes) in the same origin.
  • 'src': (In an iframe allow attribute only) The feature will be allowed in this iframe, as long as the document loaded into it comes from the same origin as the URL in the iframe's src attribute.
  • '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 values * (enable for all origins) or 'none' (disable for all origins) may only be used alone, while 'self' and 'src' may be used with one or more origins.

Features are each defined to have a default allowlist, which is one of:

  • *: The feature is allowed by default in top-level browsing contexts and all nested browsing contexts (iframes).
  • 'self': The feature is allowed by default in top-level browsing contexts and in nested browsing contexts (iframes) in the same origin. 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.

Default policy

The allow list is 'self'.

Specifications

Specification Status Comment
Feature Policy Editor's Draft Initial definition.
Encrypted Media Extensions
The definition of 'Feature Policy integration' in that specification.
Recommendation

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
encrypted-media
Experimental
Chrome Full support 60Edge Full support 79Firefox Full support 74
Full support 74
Full support 65
Disabled
Disabled From version 65: this feature is behind the dom.security.featurePolicy.header.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 48Safari No support NoWebView Android Full support 60Chrome Android Full support 60Firefox Android Full support 65
Disabled
Full support 65
Disabled
Disabled From version 65: this feature is behind the dom.security.featurePolicy.header.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 45Safari iOS No support NoSamsung Internet Android Full support 8.0

Legend

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also