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const h1Elt = document.createElement("h1"); h1Elt.classList.add("example"); h1Elt.textContent = "DOM - Positionner un élément (1)"; document.querySelector("header").insertBefore(h1Elt, document.querySelector("h2"));
const h1Elt = document.createElement("h1"); h1Elt.classList.add("example"); h1Elt.textContent = "DOM - Positionner un élément (1)"; document.querySelector("header").insertBefore(h1Elt, document.querySelector("h2"));