function node_preprocess_html
Implements hook_preprocess_HOOK() for HTML document templates.
File
- 
              core/
modules/ node/ node.module, line 442  
Code
function node_preprocess_html(&$variables) {
  // If on an individual node page or node preview page, add the node type to
  // the body classes.
  if (($node = \Drupal::routeMatch()->getParameter('node')) || $node = \Drupal::routeMatch()->getParameter('node_preview')) {
    if ($node instanceof NodeInterface) {
      $variables['node_type'] = $node->getType();
    }
  }
}
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