Exemplo link HTML Drupal 8

<?php    
  $path = $this->pathValidator->getUrlIfValid('<front>');
  $route_name = $path->getRouteName();

  $url = Url::fromRoute($route_name);
  $url->setOptions([
    'attributes' => [
      'class' => ['name-wrapper'],
    ],
  ]);

  $title = SafeMarkup::format('<span class="category-name">@text</span>', ['@text' => t('Exemplo')]);
  $link = Link::fromTextAndUrl($title, $url)->toString();