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HTML

            
              <ul class="wp_nav_menu">
  <li>
    <div>
      Foo
    </div>
    <div>
      Bar
    </div>  
  </li>
</ul>  
            
          
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CSS

            
              .wp_nav_menu div:nth-child(1) {

  background: blue;
  
}

.wp_nav_menu div:nth-child(2) {

  background: red;
  
}

            
          
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JS

            
              
            
          
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