SecurityPolicyViolationEvent: referrer property
  The referrer read-only property of the
  SecurityPolicyViolationEvent interface is a string
  representing the referrer of the resources whose policy was violated. This will be a URL
  or null.
Value
A string representing the URL of the referrer of the violating resources.
Examples
js
document.addEventListener("securitypolicyviolation", (e) => {
  console.log(e.referrer);
});
Specifications
| Specification | 
|---|
| Content Security Policy Level 3 # dom-securitypolicyviolationevent-referrer | 
Browser compatibility
BCD tables only load in the browser