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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <div>
    <div id="my-id">
      <div class="inner"></div>
    </div>
  </div>  
    <button onclick="computeResults()">Compute results</button> 
    
    <p>
        document.querySelector("#my-id").querySelectorAll("div div div").length =
        <span id="result"></span>
    </p>    
</body>
</html>
 
computeResults = function () {
    var result = document.querySelector("#my-id").querySelectorAll("div div div");
  
    document.querySelector("#result").innerHTML = result.length;
};
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lvhpro
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