Which attribute of HTML field to utilize when manually ascertaining how to identify custom field?

In such a string as <input aria-labelledby="unid-19" data-testid="slice-login-email-input" type="email" autocomplete="email" name="email" class="ltr-1ageng6 er7mpmn0" value="">, which is best used as the identifier of a custom field, if any of it?

This may be helpful, @BEEDELLROKEJULIANLOC:

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