four.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DOM with chai aur code</title>
</head>
<body style="background-color: black; color: aliceblue;">
    <ul class = "language">
        <li>javascript</li>

    </ul>
</body> 
<script>
    function addLanguage(langname) {
        const li = document.createElement('li');
        li.innerHTML = `${langname}`
        document.querySelector('.language').
        appendChild(li)
    }
    addLanguage("python")


    function addoptiLanguage(langname) {
        const li = document.createElement('li')
        li.appendChild(document.createTextNode(langname))
        document.querySelector('.language').appendChild(li)
    }
    addoptiLanguage("Golang")

    //EDIT
    const secondLang = document.querySelector("li:nth-child(2)")
    const newli = document.createElement('li')
    newli.textContent = "Mojo"
    secondLang.replaceWith(newli)

    //REMOVE
    const lastLang = document.querySelector('li:last-child')
    lastLang.remove()

</script>
</html>