web/themes/custom/mycustomtheme/mycustomtheme.theme:
function MYCUSTOMTHEME_preprocess_html(&$variables) {
$current_path = \Drupal::service('path.current')->getPath();
$path_alias = \Drupal::service('path_alias.manager')->getAliasByPath($current_path);
$current_path_ascii = preg_replace("#[^a-z0-9]#simU","", $current_path);
$variables['attributes']['class'][] = \Drupal\Component\Utility\Html::cleanCssIdentifier($current_path_ascii );
$variables['attributes']['class'][] = \Drupal\Component\Utility\Html::cleanCssIdentifier( ltrim($path_alias, '/') );
}Output:
<body class="node123 my/custom/path/for/node/123 user-logged-in path-node page-node-type-article">
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