original_string: public static function start()
      {
          if (self::$_page) {
              return null;
          }
          self::$_page = new Html\Document();
          self::$_zones['head'] = self::$_page->head();
          self::$_zones['body'] = self::$_page->body();
          ob_start();
          return self::$_page;
      }
code: public static function start()
      {
          if (self::$_page) {
              return null;
          }
          self::$_page = new Html\Document();
          self::$_zones['head'] = self::$_page->head();
          self::$_zones['body'] = self::$_page->body();
          ob_start();
          return self::$_page;
      }
code_tokens: public static function start ( ) { if ( self :: $ _page ) { return null ; } self :: $ _page = new Html \ Document ( ) ; self :: $ _zones [ 'head' ] = self :: $ _page -> head ( ) ; self :: $ _zones [ 'body' ] = self :: $ _page -> body ( ) ; ob_start ( ) ; return self :: $ _page ; }
docstring: Initialize page.
  
  @return \Asbestos\Html\Document
docstring_tokens: Initialize page .