WebView.securityStatus.securityLevel indicates everything is normal if a subresource certificate error is allowed for a resource from a different domain from the main document

I caught this whilst writing unit tests. If a secure site loads a resource from a different domain but that resource load comes with an invalid certificate, WebView.onCertificateError will fire with the isSubresource property set to true. If the application then allow's this, WebView.securityStatus.securityLevel does not indicate a degraded security level as expected.

It *does* work if the subresource is from the same domain as the main document, as that host is marked as having ran insecure content.