Default theme implementation of a container used to wrap child elements.
Used for grouped form items. Can also be used as a theme wrapper for any renderable element, to surround it with a <div> and HTML attributes. See \Drupal\Core\Render\Element\RenderElement for more information on the #theme_wrappers render array property, and \Drupal\Core\Render\Element\container for usage of the container render element.
Available variables:
template_preprocess_container()
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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!container.html.twig/8.1.x