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                <div id="vide">Activez JavaScript</div>




                // Un objet representant la balise <div id="vide">
var div = document.querySelector('#vide');

// On commence par vider la balise
div.innerHTML = '';

// On crée du texte
var texte = document.createTextNode('Hello');
// et une balise <p>
var par = document.createElement('p');
// On ajoute le texte dans le <p>
// et le <p> dans le <div>

// Petit raccourci pour en avoir moins à taper
var par2 = div.appendChild(document.createElement('p'));
par2.textContent = "Et encore hello";

// Pourquoi pas mettre ça dans une fonction?
function append(parent, balise) {
  return parent.appendChild(document.createElement(balise));

append(div, 'p').textContent = "bye";