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                <!DOCTYPE html>
        <title>Cours jQuery</title>
        <meta charset="utf-8">
    <body class="light">
        <button id="b1">Changer le thème</button>
        <button id="b2">Changer la police</button>
        <p>Famille de polices actuellement utilisée : <span id="police"></span></p>
            <p>Un premier paragraphe</p>
            <p>Un deuxième paragraphe</p>
        <p id="p3">Troisième paragraphe hors div</p>




    //Récupère la police et l'affiche 
    let police = $("body").css("font-family");

    //Lors du clic sur le bouton #b1...
        //Toggle la classe et accroche des styles à chaque classe
        $("body").toggleClass("light dark");
        $(".light").css({"background-color": "#fafafa", "color": "#333"});
        $(".dark").css({"background-color": "#444", "color": "#fff"});

    //Lors du clic sur le bouton #b2...
        //Change la police d'écriture
        $("body").css("font-family", "Nunito, Futura, Verdana");

        //Met à jour la valeur du span
        police = $("body").css("font-family");