FeaturePolicy.allowedFeatures() - Web APIs 编辑

Experimental

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

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

Syntax

const allowed = FeaturePolicy.allowedFeatures()

Parameters

None.

Return value

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

Example

The followin 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 corrsponding permission yet.

// First, get the Feature 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

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