Default theme implementation for a menu block.
Available variables:
Headings should be used on navigation menus that consistently appear on multiple pages. When this menu block's label is configured to not be displayed, it is automatically made invisible using the 'visually-hidden' CSS class, which still keeps it visible for screen-readers and assistive technology. Headings allow screen-reader and keyboard only users to navigate to or skip the links. See http://juicystudio.com/article/screen-readers-display-none.php and http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
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https://api.drupal.org/api/drupal/core!modules!system!templates!block--system-menu-block.html.twig/8.1.x