FeaturePolicy: allowsFeature() method

Limited availability

The allowsFeature() method of the FeaturePolicy interface enables introspection of individual directives of the Permissions Policy it is run on. It returns a Boolean that is true if and only if the specified feature is allowed in the specified context (or the default context if no context is specified).

Syntax

allowsFeature(feature)
allowsFeature(feature, origin)

Parameters

• feature
  • : The specific feature name to check its availability.
• origin Optional
  • : The specific origin name to check its availability. If not specified, the default origin will be used.

Return value

A Boolean that is true if and only if the feature is allowed.

Example

The following example queries whether or not the document is allowed to use camera API by the Permissions Policy. Please note that Camera API might be restricted by the Permissions API, if the user did not grant the corresponding permission yet.

// First, get the Feature Policy object
const featurePolicy = document.featurePolicy;

// Then query feature for specific
const allowed = featurePolicy.allowsFeature("camera");

if (allowed) {
  console.log("FP allows camera.");
} else {
  console.log("FP does not allows camera.");
}

Specifications

Browser compatibility