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add_filter('wp_nav_menu_items', 'add_line', 10, 2);
function add_line($items, $args) {
  if ($args->theme_location == 'primary') {
    // my code here
  return $items;

Instead of the above, which uses "theme_location" to target a specific menu, can I target a nav menu via its id/class name instead?

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