block--system-messages-block.html.twig

{#
/**
 * @file
 * Default theme implementation for the messages block.
 *
 * Removes wrapper elements from block so that empty block does not appear when
 * there are no messages.
 *
 * Available variables:
 * - content: The content of this block.
 *
 * @ingroup themeable
 */
#}
{{ content }}

{#
  The Umami theme is for demonstration only.

  Umami uses a web component for rendering messages. The component is
  "<drupal-umami-messages>".

  This implementation is a trial only and should not be used on production
  sites.

  @see https://www.drupal.org/project/drupal/issues/3476471
  @see https://developer.mozilla.org/en-US/docs/Web/API/Web_components
#}

<template id="umami-messages-template">
  <h2 part="heading">
    <slot name="title"></slot>
  </h2>
  <div part="content">
    <div part="icon"></div>
    <slot name="content"></slot>
  </div>
</template>