How to remove id="node-[nid]" with Display Suite?
Below code is quoted from template.php of Tao.

/**
 * Implementation of preprocess_node().
 */
function tao_preprocess_node(&amp;$vars) {
  $vars['hook'] = 'node';

  $vars['classes_array'][] = 'clearfix';

  $vars['attributes_array']['id'] = "node-{$vars['node']-&gt;nid}";

  ...


The ID is added by this line.

$vars['attributes_array']['id'] = "node-{$vars['node']-&gt;nid}";

You can override it by implementing the same hook function in template.php of your custom child theme.

/**
 * Implements hook_preprocess_node().
 */
function mytheme_preprocess_node(&amp;$vars) {
  unset($vars['attributes_array']['id']);
}