Preview form Error messages in posted sites

I want to share the success and error states of a form with a client, but only the success state is viewable in the native Webflow form. Empty fields get a nice default error message*:

But malformed information gets a browser error instead of the error state message that I set up in the Webflow form widget:

Please provide some way to share the look of that state, thanks!

  • PS, it would be nice to have access to this to edit as well!