The id property of the Credential interface returns a string containing the credential's identifier. This might be any one of a GUID, username, or email address. 
 The id property of the Credential interface returns a string containing the credential's identifier. This might be any one of a GUID, username, or email address. 
A string containing the credential's identifier.
| Specification | 
|---|
| Credential Management Level 1  # dom-credential-id  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
id | 
51 | 18 | 60 | No | 38 | 13 | 51 | 51 | 60 | 41 | 13 | 5.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/Credential/id