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$build = [];
$build['hello'] = [
  '#type' => 'html_tag',
  '#tag' => 'p',
  '#value' => $this->t('Hello World'),
];
$build['guten_tag'] = [
  '#type' => 'html_tag',
  '#tag' => 'marquee,
  '#attributes' => ['direction' => 'right', 'scrollamount' => 10],
  '#value' => $this->t('Hallo Welt!'),
];