Basically, I want to add the border-top: 3px only if .title .lengthyText #childmenuList has the #highLayer id attribute. If there is no #highLayer id attribute, then there is no border-top: 3px.

I know I can use the :has() pseudo-class to check if #highLayer is present or not(I showed it below). But say that I can’t use the :has() pseudo-class, is there another way to write this CSS?

.title.lengthyText:has(#highLayer) #childmenuList {
  border-top: 3px;
}

<div class="title lengthyText">
  <div class="subcontainer">
    <nav id="highLayer" class="high-lay">Nav</nav>
  </div>
  <div id="childmenuList">child menu</div>
</div>