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domcreate.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<ol id="lista" >
<li>Elemento N1</li>
<li>Elemento N2</li>
</ol>
<script>
var lista = document.createElement("li")
var contenido = document.createTextNode("Elemento N3")
lista.appendChild(contenido)
//Metodo 1
var contenedor = document.getElementById("lista").appendChild(lista)
//Metodo 2
//var contenedor = document.getElementsByTagName("li")[0].parentNode
//contenedor.appendChild(lista)
//Metodo 3
//var contenedor = document.getElementsByTagName("li")[0].parentNode
//var posicion = document.getElementsByTagName("li")[0]
//contenedor.insertBefore(lista, posicion)
</script>
</body>
</html>