This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The RTCPeerConnection.onidpassertionerror event handler is a property containing the code to execute whent the idpassertionerror event, of type RTCIdentityErrorEvent, is received by this RTCPeerConnection. Such an event is sent when the associated identity provider (IdP) encounters an error while generating an identity assertion.
peerconnection.onidpassertionerror = function;
function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. An event handler always has one single parameter, containing the event, here of type RTCIdentityErrorEvent.pc.onidpassertionerror = function(ev) { alert("onidpassertionerror event detected!"); };
 | Specification | Status | Comment | 
|---|---|---|
| WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCPeerConnection.onidpassertionerror' in that specification.  |  Candidate Recommendation | Initial specification. | 
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 56 | Yes | 22 | ? |  43
  | 
? | 
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 56 | 56 | Yes | 44 |  43
  | 
? | 6.0 | 
idpassertionerror event and its type, RTCIdentityErrorEvent.
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    https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/onidpassertionerror