Resize/scroll

Razmoquette
Javascript

Bonjour,

Je suis en ce moment le cours "Apprendre le Javascript: chapitre 16, TP: Menu collant" sur YT. Malheureusement à l'étape du "resize" ça ne marche pas comme prévu alors que je pense avoir tout fait pareil sauf au niveau de l'html/css. Quand je redimensionne ma page, elle commence à scroller automatiquement vers le bas et le resize ne marche pas très bien.
Merci d'avance pour votre aide !

Code HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <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>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>

    <div class="header">
            <div class="topbar">
                    Logo
                </div>

                <div class="menu">
                    <div><a href="#">Item</a></div>
                    <div><a href="#">Item</a></div>
                    <div><a href="#">Item</a></div>
                    <div><a href="#">Item</a></div>
                    <div><a href="#">Item</a><div class="submenu">
                        <div><a href="#">Choix</a></div>
                        <div><a href="#">Choix</a></div>
                        <div><a href="#">Choix</a></div>
                    </div></div>
                </div>
    </div>

    <div style="height: 4400px">
        Du Texte <br>
        <br> Lorem ipsum dolor sit amet consectetur adipisicing elit. Provident sint doloribus architecto dignissimos unde possimus impedit explicabo, minus voluptatem eum labore culpa a mollitia deleniti aspernatur et earum dolorem magnam.
    </div>

<script src="script.js"></script>
</body>
</html>

Code CSS

*{
    box-sizing: border-box;
}

body{
    padding: 15px;
    margin: 0;  
    font-family: Arial, Helvetica, sans-serif;
}

a{
    text-decoration: none;
    background: white;
}

.topbar{
    border: solid 1px gray;
    padding: 15px;
    font-weight: bold;
}

.menu{
    display: flex;
    border: solid 1px gray;
    border-top: none;
    background: white;
}

.header{
    box-shadow: 0px 2px 8px 2px rgba(0, 0, 0, 0.13);
}

.menu > div{
    border-right: 1px solid gray;
}

.menu > div > a{
    display: block;
    padding: 10px;
    font-size: 1.5em;
}

.menu > div > a:hover{
    background: lightsteelblue;
    color: white;
}

.submenu{
    display: none;
}

.submenu a{
    display: block;
    width:100%;
    height: 47.2px;
    border: 1px solid gray;
    border-top: none;
    text-align: center;
    line-height: 47.2px;
}

.submenu a:hover{
    background: lightsteelblue;
    color: white;
}

.menu > div:hover .submenu{
    display: block;
    position: absolute;
    z-index: 100;
    width: 68.69px;
    margin-left:-1px;
}

.fixed{
    position: fixed;
    top: 0;
}

Code JS 

(function (){
    /*When we scroll
        add class fixed to the menu
    */

    let scrollY = function () {
        var supportPageOffset = window.pageXOffset !== undefined;
        var isCSS1Compat = ((document.compatMode || "") === "CSS1Compat");

        return supportPageOffset ? window.pageYOffset : isCSS1Compat ? document.documentElement.scrollTop : document.body.scrollTop;
    }

    //var
    let element = document.querySelector(".menu")
    let rect = element.getBoundingClientRect()
    let top = rect.top + scrollY()
    let width = rect.width
    let fake = document.createElement("div")

    //changing the size of the fake element
    fake.style.width = rect.width + "px"
    fake.style.height = rect.height + "px"
    //

    //Functions
    let onScroll = function() {

        let hasScrollClass = element.classList.contains("fixed")

        //check if has fixed class and add or remove fixed
        if(scrollY() > top && !hasScrollClass){
            //add fixed
            element.classList.add("fixed")
            //add width
            element.style.width = width + "px"
            //add fake element
            element.parentNode.insertBefore(fake, element)

        } else if(scrollY() < top && hasScrollClass) {
            element.classList.remove("fixed")
            element.parentNode.removeChild(fake)
        }
    }
    //
    let onResize = function () {
        element.style.width = "auto"
        element.classList.remove("fixed")
        fake.style.display = "none"
        rect = element.getBoundingClientRect()
        top = rect.top + scrollY()
        fake.style.width = rect.width + "px"
        fake.style.height = rect.height + "px"
        fake.style.display = "block"
        onScroll()
    }

    //events listener
    //add event  on scroll
    window.addEventListener("scroll", onScroll)
    window.addEventListener("resize", onResize)

})()

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