Error messages persistent

This is an in-progress draft. The content is incomplete and could change substantially.

Supplemental requirement developing

Error messages persist at least until the error is resolved or the user dismisses them.

Keep track of the state of the error and make visibility of the error message depending on this state.
In a form, revalidate all fields when the form is submitted and remove all error messages that are no longer relevant.
Add a “Dismiss” button to the error that makes the error message disappear.

Procedure

For each error message:

Check that the error message persists until the user fixes the error or dismisses the message.

Expected results