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                <!DOCTYPE html>
<html lang="fr">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Afficher / cacher un div</title>
    <h1>Comment afficher ou masquer un élément HTML</h1>
    <div id="d1">
        <p>Ce texte appartient au premier div de ma page</p>
        <p id="p1" class="hide">Ce deuxième paragraphe également</p>
    <div id="d2">
        <p>Il existe deux façons de cacher un élément <span>comme un div</span> en CSS :</p>
        <ul id="l1" class="hide">
            <li>Utiliser visibility: hidden</li>
            <li>Utiliser display: none</li>


                #d1{background-color: #EECC4499;}
#d2{background-color: #44EEAA99;}
.hide{display: none;}


                let d1 = document.getElementById("d1");
let d2 = document.getElementById("d2");
let p1 = document.getElementById("p1");
let l1 = document.getElementById("l1");

d1.addEventListener("mouseover", () => { = "block";});
d1.addEventListener("mouseout", () => { = "none";});

d2.onmouseover = aff;
function aff(){ = "block";
d2.onmouseout = cac;
function cac(){ = "none";