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Insert element before another element by using document body insertBefore

< html>     <head>         <title>insertBefore() Example</title>         <script type="text/javascript">             function insertMessage() {                 var oNewP = document.createElement("p");                 var oText = document.createTextNode("www.rntsoft.com");                 oNewP.appendChild(oText);                 var beforeMe = document.getElementsByTagName("p")[0];                 document.body.insertBefore(oNewP, beforeMe);             }         </script>     </head>     <body onload="insertMessage()">         <P>Hello World!</p>     </body> </html>