JSFiddle - React, Tailwind, and code Playground

HTML

<div id="aaa">
   
      Some text here
    
    <p id="bbb">More text here</p>     <!-- Selected [1] -->
    <blockquote>
        <p id="bbb">And more text here</p> <!-- Not selected [2] -->
    </blockquote>
</div>

CSS

#aaa:has(#bbb)  {background-color:yellow}