Steps to reproduce the issue

From the login screen force an error - eg by entering the wrong password

Expected result

Error message displayed and keyboard focus is on the first field

Actual result

Error message displayed and keyboard focus is on the alert

The problem appears to be that there is always close button on the alert and that always gets focus because there is a dismiss attribute which only has one value of true

Additional comments

Possibly related - not sure
The documentation here https://joomla-projects.github.io/custom-elements/#/alert refers to various features which don't appear to be implemented - eg autodismiss where there is no observer