CodePen Embed - CSS Basics 3

<div>a div</div>
<div>another div</div>

<div>
  parent div
  <div>nested div</div>
  <div>
    nested div
    <div>nested div in nested div</div>
  </div>    
</div>

span {
  border: 1px solid red;
}

div {
  border: 1px solid green;
}

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