Video embed markup doesn't pass the W3C validator

Attaching a patch

This issue can be solved by the folowing method without the need for a patch.

function EXAMPLE_video_embed_handler_info_alter(&$handlers) {
  $handlers['youtube']['function'] = '_EXAMPLE_video_embed_field_handle_youtube';
}

Then in _EXAMPLE_video_embed_field_handle_youtube simply place a copy of the original handler taking out any options you dont want rendered, the code below has the width and height options removed.

function _EXAMPLE_video_embed_field_handle_youtube($url, $settings) {
  $output = array();
  // Grab the minutes and seconds, and just convert it down to seconds.
  preg_match('/#t=((?P<min>\d+)m)?((?P<sec>\d+)s)?/', $url, $matches);
  // Give it some default data in case there is no #t=...
  $matches += array(
    "min" => 0,
    "sec" => 0,
  );
  $time = ($matches["min"] * 60) + $matches["sec"];
  $settings['start'] = $time;
  $id = _video_embed_field_get_youtube_id($url);
  if (!$id) {
    // We can't decode the URL - just return the URL as a link.
    $output['#markup'] = l($url, $url);
    return $output;
  }
  // Construct the embed code.
  $settings['wmode'] = 'opaque';
  $settings_str = _video_embed_code_get_settings_str($settings);
  $output['#markup'] = '<iframe title="' . drupal_get_title() . '" src="//www.youtube.com/embed/' . $id . '?' . $settings_str . '"></iframe>';
  return $output;
}