alexander-young

function defer_parsing_of_js($url)
{
  if (is_admin()) return $url; //don't break WP Admin
  if (false === strpos($url, '.js')) return $url;
  if (strpos($url, 'jquery.js')) return $url;
  return str_replace(' src', ' defer src', $url);
}
add_filter('script_loader_tag', 'defer_parsing_of_js', 10);

alexander-young

function upload_svg_files( $allowed ) {
    if ( !current_user_can( 'manage_options' ) )
        return $allowed;
    $allowed['svg'] = 'image/svg+xml';
    return $allowed;
}
add_filter( 'upload_mimes', 'upload_svg_files');