Default theme implementation for a set of links.
Available variables:
If the heading is a string, it will be used as the text of the heading and the level will default to 'h2'.
Headings should be used on navigation menus and any list of links that consistently appears on multiple pages. To make the heading invisible use the 'visually-hidden' CSS class. Do not use 'display:none', which removes it from 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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Licensed under the GNU General Public License, version 2 and later.
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https://api.drupal.org/api/drupal/core!modules!system!templates!links.html.twig/8.1.x