drupal_placeholder($text)
Formats text for emphasized display in a placeholder inside a sentence.
in Drupal 8.0.0, will be removed before Drupal 9.0.0. Use \Drupal\Component\Utility\SafeMarkup::format() or Twig's "placeholder" filter instead. Note this method should not be used to simply emphasize a string and therefore has few valid use-cases. Note also, that this method does not mark the string as safe.
\Drupal\Component\Utility\SafeMarkup::format()
function drupal_placeholder($text) {
return '<em class="placeholder">' . Html::escape($text) . '</em>';
}
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https://api.drupal.org/api/drupal/core!includes!bootstrap.inc/function/drupal_placeholder/8.1.x