Web/API/FeaturePolicy/getAllowlistForFeature

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

The getAllowlistForFeature() method of the FeaturePolicy allows query of the allow list for a specific feature for the current Feature Policy.

Syntax

const allowlist = FeaturePolicy.getAllowlistForFeature(<feature>)

Parameter

Feature name

A specific feature name must be specified.

Return value

An Allow list for the specified feature.

Errors

The function will raise a warning if the specified Feature Policy directive name is not known. However, it will also return empty array, indicating that no origin is allowed to use the feature.

Example

The following example prints all the origins that are allowed to use Camera API by the Feature 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 allowlist = featurePolicy.getAllowlistForFeature("camera")

for (const origin of allowlist) {
  console.log(origin)
}

Specification

Specification	Status	Comment
Permissions PolicyThe definition of 'getAllowlistForFeature' 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
`getAllowlistForFeature` Experimental'	Chrome Full support 74 Full support 74 No support 69 — 73 Disabled' Disabled' From version 69 until version 73 (exclusive): this feature is behind the `#enable-experimental-productivity-features` preference (needs to be set to `Enabled`). To change preferences in Chrome, visit chrome://flags.	Edge Full support 79	Firefox Full support 65 Disabled' Full support 65 Disabled' Disabled' From version 65: 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 Full support 62 No support 56 — 62 Disabled' Disabled' From version 56 until version 62 (exclusive): this feature is behind the `#enable-experimental-productivity-features` preference (needs to be set to `Enabled`).	Safari No support No	WebView Android Full support 74	Chrome Android Full support 74 Full support 74 No support 69 — 74 Disabled' Disabled' From version 69 until version 74 (exclusive): this feature is behind the `#enable-experimental-productivity-features` preference (needs to be set to `Enabled`). To change preferences in Chrome, visit chrome://flags.	Firefox Android Full support 65 Disabled' Full support 65 Disabled' Disabled' From version 65: 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.	Opera Android Full support 48 Disabled' Full support 48 Disabled' Disabled' From version 48: this feature is behind the `#enable-experimental-productivity-features` preference (needs to be set to `Enabled`).	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.getAllowlistForFeature() by Mozilla Contributors is licensed under CC-BY-SA 2.5.