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HTML

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

                <p>Méthodes permettant de <span>descendre</span> le DOM :</p>
                <ul id="enfants">
                    <li>children()</li>
                    <li>find()</li>
                </ul>
            </div>
        </div>
        <footer>
            <ul>
                <li>Elément de pied de page n°1</li>
                <li>Elément de pied de page n°2</li>
            </ul>
        </footer>
    </body>
</html>
              
            
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CSS

              
                
              
            
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JS

              
                $(document).ready(function(){
    /*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");
});

              
            
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999px

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