<li id="menu-item-55" class="menu-item menu-item-type-publish_type menu-item-object-page menu-item-55">

<li class="page_item page-item-37">

recption menus and pages make its very own li class and id.

how you can take them off within the functions.php file for that menu but for the pages list.

You need to have the ability to take them off by connecting into a few filters and coming back empty arrays or strings instead of new classes or ids:

add_filter('nav_menu_css_class', 'my_css_characteristics_filter', 100, 1)

add_filter('nav_menu_item_id', 'my_css_characteristics_filter', 100, 1)

add_filter('page_css_class', 'my_css_characteristics_filter', 100, 1)

function my_css_characteristics_filter($var) 


Should you desired to keep particular classes you could do this something similar to this:

function my_css_characteristics_filter($var) 

it is really an addition on the top of Richard answer.

just in case you need to alter the current-menu-item class to another thing.

        add_filter('nav_menu_css_class', 'my_css_characteristics_filter', 100, 1)

        add_filter('nav_menu_item_id', 'my_css_characteristics_filter', 100, 1)

        function my_css_characteristics_filter($var) 

            else

        return $selavaend