HTML5: How to specify one or more forms the keygen element belongs to?

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HTML Code:

<!DOCTYPE html>
  <meta charset="utf-8">
  <title>How to specify one or more forms 
the keygen element belongs to</title>
<form  method="post" 
answer-demo.php" id="secureform">
  Email: <input type="text" name="email">
  <input type="submit">
<p>The keygen field below is outside the 
form element, but still part of the 
Encryption: <keygen name="security" 

Live Demo:

See the Pen keygen-form-answer by w3resource (@w3resource) on CodePen.

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