add element to another element using javascript

<html>
 <head>
  <title>add element to another element using javascript</title>
 </head>
 <body style="background:lightgray">
  <p>Click the button to test:</p>
  <button onclick="test()">add p element into a div element</button>
  </br>
  <textarea id="edit" style="height:200px;width:240px">
    <p>hello world<span>!</span></p>
  </textarea>
  <script>
  function test() {
   var el = document.createElement( 'body' );
   var edit= document.getElementById("edit");
   var div= document.createElement( 'div' );
   div.innerHTML =edit.value;
   addElement(el,div);
   edit.value=el.innerHTML;
  }
  function addElement(father,child) {
   father.appendChild(child);
  }
  </script>
 </body>
</html>

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