Web/API/FeaturePolicy/features

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

The features() method of the FeaturePolicy interface returns a list of names of all features supported by the User Agent. Feature whose name appears on the list might not be allowed by the Feature Policy of the current execution context and/or might not be accessible because of user's permissions.

Syntax

const supportedFeatures = FeaturePolicy.features()

Parameters

None.

Return value

A list of strings that represent names of all Feature Policy directives supported by the User Agent.

Example

The followin example logs all the supported directives in the console.

// Get the Feature Policy object
const featurePolicy = document.featurePolicy

// Retreive the list of all supported Feature Policy directives
const supportedDirectives = featurePolicy.features()

// Print out each directive into the console
for (const directive of supportedDirectives){
  console.log(directive)
}

Specification

Specification	Status	Comment
Permissions PolicyThe definition of 'features' in that specification.	Editor's Draft	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`features` Experimental'	Chrome Full support 74	Edge Full support 79	Firefox Full support 70 Disabled' Full support 70 Disabled' Disabled' From version 70: this feature is behind the `dom.security.featurePolicy.webidl.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 62	Safari No support No	WebView Android Full support 74	Chrome Android Full support 74	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android Full support 11.0

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.

FeaturePolicy.features() by Mozilla Contributors is licensed under CC-BY-SA 2.5.