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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="test"><p>Testing</p></div>
  
  <form method="post" onsubmit="return false;">
    <label for="name">Name:</label> <input type="text"><br>
    <label for="address">Address:</label> <input type="text"><br>
    <label for="telephone">Telephone:</label> <input type="text"><br>
    <select id="selectEl">
      <option>One</option>
      <option>One</option>
      <option>One</option>
      <option>One</option>
    </select>
      
    <input type="submit"><br>
    <input type="hidden" value="whatever">
  </form>
</body>
</html>
 
​
var myForm = document.forms[0],
    formLength = myForm.length,
    selectEl = document.getElementById('selectEl'),
    selectLength = selectEl.length,
    myDiv = document.getElementById('test');
​
console.log(document.body.length); //=> undefined
console.log(myDiv.length); //=> undefined
​
if (formLength > 2) {
  myForm.insertAdjacentHTML(
    'beforeend',
    formLength + ' items in the form<br>'
  );
  
  myForm.insertAdjacentHTML(
    'beforeend',
    selectLength + ' items in the select element'
  );
}
Output

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