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

The referrer read-only property of the SecurityPolicyViolationEvent interface is a USVString representing the referrer of the resources whose policy was violated. This will be a URL or null.


let referrer = violationEventInstance.referrer;


A USVString representing the URL of the referrer of the violating resources.


document.addEventListener("securitypolicyviolation", (e) => {


Specification Status Comment
Content Security Policy Level 3
The definition of 'referrer' in that specification.
Working Draft Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes15591 No Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes591 Yes Yes Yes

1. From version 59: this feature is behind the security.csp.enable_violation_events preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills
Last updated by: fscholz,