Document: securitypolicyviolation event
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2022.
The securitypolicyviolation event is fired when a Content Security Policy is violated.
The event is fired on the document when there is a violation of the document CSP policy (and may also bubble from elements in the document).
This event bubbles to the Window object, and is composed.
Note:
You should generally add the handler for this event to a top level object (i.e., Window or Document).
While HTML elements can technically be the target of the securitypolicyviolation event, in reality this event does not fire on them—for example, a blocked <img> source directly triggers this event on document as the target, instead of bubbling from the <img> element.