This article covers situations where you have a top navigation but you want to keep the parent page selected/highlighted/active when the visitor goes to one of its subpages.

WordPress adds a class "current_page_ancestor" to a parent page which you can use to apply the same styling as for current page i.e. "current_page_item"

 

.current_page_item,
.current_page_ancestor {
   background:yellow;
}

Credits:

 

Keywords: How to highlight "parent" navigation link when on "child" page

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