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                <!DOCTYPE html>
        <title>Cours jQuery</title>
        <meta charset="utf-8">
            body, div{padding: 10px;}
        <div class="conteneur">
            <h1>Cours jQuery</h1>
                <p>Un paragraphe HTML</p>
                <p>Méthodes jQuery permettant de <span>remonter</span> le DOM :</p>
                <ul id="parents">

                <p>Méthodes permettant de <span>descendre</span> le DOM :</p>
                <ul id="enfants">
                <li>Elément de pied de page n°1</li>
                <li>Elément de pied de page n°2</li>




    /*Sélectionne tous les ancêtres des éléments ul et ajoute une bordure 
    noire d'1px autour de chacun d'entre eux*/
    $("ul").parents().css("border", "1px solid black");

    /*Ne cible que les ancêtres des éléments ul qui sont des div et change 
    leur couleur de fond en bleu*/
    $("ul").parents("div").css("background-color", "lightBlue");