FeaturePolicy.features() - Web APIs 编辑

Experimental

This is an experimental technology
Check 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)
}

Specifications

Browser compatibility

BCD tables only load in the browser