Determine when there is an error submitting the wp-signup.php form

[henry.wright]

For both the wp-signup.php user and blog forms there doesn't seem to be a way to determine if an error occurred in the form submission aside from error text being displayed above the form.

If a body class of something like error is added or something like error=true is appended to the query string then developers will be able to perform actions or style the page easier.