What is “data-com.bitwarden.browser.user-edited="yes"” for?

The title should be

What is “data-com.bitwarden.browser.user-edited="yes"” for?

but Discourse beautifies it.

I noticed it when observing <input aria-labelledby="unid-19" data-testid="slice-login-email-input" type="email" autocomplete="email" name="email" class="ltr-1ageng6 er7mpmn0" value="" data-com.bitwarden.browser.user-edited="yes"> of “Which attribute of HTML field to utilize when manually ascertaining how to identify custom field?”.