This is a testharness.js-based test.
FAIL PublicKeyCredential interface: existence and properties of interface object Cannot read property 'has_extended_attribute' of undefined
PASS PublicKeyCredential interface object length 
PASS PublicKeyCredential interface object name 
FAIL PublicKeyCredential interface: existence and properties of interface prototype object Cannot read property 'has_extended_attribute' of undefined
PASS PublicKeyCredential interface: existence and properties of interface prototype object's "constructor" property 
PASS PublicKeyCredential interface: attribute rawId 
PASS PublicKeyCredential interface: attribute response 
PASS AuthenticatorResponse interface: existence and properties of interface object 
PASS AuthenticatorResponse interface object length 
PASS AuthenticatorResponse interface object name 
PASS AuthenticatorResponse interface: existence and properties of interface prototype object 
PASS AuthenticatorResponse interface: existence and properties of interface prototype object's "constructor" property 
PASS AuthenticatorResponse interface: attribute clientDataJSON 
PASS AuthenticatorAttestationResponse interface: existence and properties of interface object 
PASS AuthenticatorAttestationResponse interface object length 
PASS AuthenticatorAttestationResponse interface object name 
PASS AuthenticatorAttestationResponse interface: existence and properties of interface prototype object 
PASS AuthenticatorAttestationResponse interface: existence and properties of interface prototype object's "constructor" property 
PASS AuthenticatorAttestationResponse interface: attribute attestationObject 
PASS AuthenticatorAssertionResponse interface: existence and properties of interface object 
PASS AuthenticatorAssertionResponse interface object length 
PASS AuthenticatorAssertionResponse interface object name 
PASS AuthenticatorAssertionResponse interface: existence and properties of interface prototype object 
PASS AuthenticatorAssertionResponse interface: existence and properties of interface prototype object's "constructor" property 
PASS AuthenticatorAssertionResponse interface: attribute authenticatorData 
PASS AuthenticatorAssertionResponse interface: attribute signature 
PASS WebAuthentication interface: existence and properties of interface object 
PASS WebAuthentication interface object length 
PASS WebAuthentication interface object name 
PASS WebAuthentication interface: existence and properties of interface prototype object 
PASS WebAuthentication interface: existence and properties of interface prototype object's "constructor" property 
PASS WebAuthentication interface: operation makeCredential(MakeCredentialOptions) 
PASS WebAuthentication interface: operation getAssertion(PublicKeyCredentialRequestOptions) 
PASS WebAuthentication must be primary interface of navigator.authentication 
PASS Stringification of navigator.authentication 
PASS WebAuthentication interface: navigator.authentication must inherit property "makeCredential" with the proper type (0) 
PASS WebAuthentication interface: calling makeCredential(MakeCredentialOptions) on navigator.authentication with too few arguments must throw TypeError 
PASS WebAuthentication interface: navigator.authentication must inherit property "getAssertion" with the proper type (1) 
PASS WebAuthentication interface: calling getAssertion(PublicKeyCredentialRequestOptions) on navigator.authentication with too few arguments must throw TypeError 
Harness: the test ran to completion.