FeaturePolicy: allowsFeature() method

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

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).


allowsFeature(feature, origin)



The specific feature name to check its availability.

origin Optional

The specific origin name to check its availability. If not specificed, the default origin will be used.

Return value

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


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.");


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