container_class doesn’t seem to be working

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By default the wp_nav_menu() function generates HTML with both a container and UL menu. It will, by default, output some HTML structure that looks like this:

<div id="container_id" class="container_class">
    <ul id="menu_id" class="menu_class">
        <li>...</li>
    </ul>
</div>

Since you have defined the container as a ul, WordPress will try to keep the some valid HTML standards by only allowing the container to be one of 2 block level elements, See Line 152:

  • <div>
  • <nav>

You can filter it but I wouldn’t suggest it. So by passing a ul to the container it ignores it and since it’s being ignored it doesn’t consider it a container and thus you cannot add a container class or container ID.

The ul would be your menu which is why you can add menu_class and menu_id.

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