FeaturePolicy: allowedFeatures() method
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 Permissions Policy. This enables introspection of individual directives
of the Permissions Policy it is run on. As such, allowedFeatures() method
returns a subset of directives returned by features().
Syntax
allowedFeatures()
Parameters
None.
Return value
An array of strings representing the Permissions Policy directive names that are allowed by the Permissions Policy this method is called on.
Example
The following 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 corresponding permission yet.
// First, get the Permissions Policy object
const featurePolicy = document.featurePolicy;
// Then query feature for specific
const allowed = featurePolicy.allowedFeatures();
for (const directive of allowed) {
console.log(directive);
}
Specifications
This feature does not appear to be defined in any specification.Browser compatibility
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allowedFeatures
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- User must explicitly enable this feature.