function manipulate_04() {
    // DOM Manipulation_04:
    // Insert li in the DOM and specifically before
    // li in the first position
    var btn04 = document.getElementById("btn04");
    // create a new li element
    var newLi = document.createElement("li");
    var list = document.getElementById("ourList");
    // create text to display at li
    newLi.innerHTML = "This is Line 1";
    // insert li in the first position
    list.insertBefore(newLi, list.getElementsByTagName("li")[0]);
    btn04.classList.add("hide-btn");
}