<div id="seasonslist1"><p><button onclick="makeSeasonsList(); return false;" type="submit">Click to append list of seasons</button></p>
</div>

In script element within head element (<script type="text/javascript">):

function makeSeasonsList() {
    var ul_node = document.createElement("ul");

    // Autumn
    var li_node1 = document.createElement("li");
    var li_text1 = document.createTextNode("Autumn");
    li_node1.appendChild(li_text1);

    // Winter 
    var li_node2 = document.createElement("li");
    var li_text2 = document.createTextNode("Winter");
    li_node2.appendChild(li_text2);
    
    // Spring
    var li_node3 = document.createElement("li");
    var li_text3 = document.createTextNode("Spring");
    li_node3.appendChild(li_text3);

    // Summer
    var li_node4 = document.createElement("li");
    var li_text4 = document.createTextNode("Summer");
    li_node4.appendChild(li_text4);

    // Append the list items to the ul
    ul_node.appendChild(li_node1);
    ul_node.appendChild(li_node2);
    ul_node.appendChild(li_node3);
    ul_node.appendChild(li_node4);

    // Place on page
    var container = document.getElementById("seasonslist1");
    container.appendChild(ul_node);
}