Edge shows error message every time you focus on a field. Useful!
FF and Edge show red borders around every incorrect field.
onblur reportValidity: Chrome refuses to move from field; FF shows error message but only when you go down in form; Edge seems to do a secret
check whenever you focus on the field and show first title, then error message.
ANY reportValidity in Chrome: focus refuses to budge from invalid field because it is immediately focused again.
When do native error messages appear? How can you suppress them?