FeaturePolicy: allowedFeatures() method

Limited availability

The allowedFeatures() method of the FeaturePolicy interface returns a list of directive names of all features allowed by the Permissions Policy. This enables introspection of individual directives of the Permissions Policy it is run on. As such, allowedFeatures() method returns a subset of directives returned by features().

Syntax

allowedFeatures()

Parameters

None.

Return value

An array of strings representing the Permissions Policy directive names that are allowed by the Permissions Policy this method is called on.

Example

The following example logs all the allowed directives for the current document. Please note that these features might be restricted by the Permissions API, if the user did not grant the corresponding permission yet.

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

// Then query feature for specific
const allowed = featurePolicy.allowedFeatures();

for (const directive of allowed) {
  console.log(directive);
}

Specifications

Browser compatibility