Default theme implementation for status messages.
Displays status, error, and warning messages, grouped by type.
An invisible heading identifies the messages for assistive technology. Sighted users see a colored box. See http://www.w3.org/TR/WCAG-TECHS/H69.html for info.
Add an ARIA label to the contentinfo area so that assistive technology user agents will better describe this landmark.
Available variables:
message_list: List of messages to be displayed, grouped by type.
status_headings: Lis