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:
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https://api.drupal.org/api/drupal/core!modules!system!templates!status-messages.html.twig/8.1.x