CodePen

HTML

            
              <div class='aa'>
  <div class='bb'>
    <div class='cc'>
       with .bb
    </div>
  </div>
</div>


<div class='aa'>
  <div class='cc'>
    no .bb
  </div>
</div>

            
          
!

↑ Insert the most common viewport meta tag

CSS

            
              .aa
  > .bb, &
    > .cc
      background: lime

            
          
!
? ?
? ?
Must be a valid URL.
+ add another resource
via CSS Lint

JS

            
              
            
          
!
Must be a valid URL.
+ add another resource
via JS Hint
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