text: function escaping(input) {
    let forbidden = ["&", "<", ">", '"'];
    let allowed = ["&amp;", "&lt;", "&gt;", "&quot;"];
  
    let html = "<ul>\n";
  
    for(let line of input) {
      html += "  <li>";
      for(let i in forbidden) {
        line = line.split(forbidden[i]).join(allowed[i]);
      }
      html += line + "</li>\n";
    }
  
    html += "</ul>";
  
    return html;
  }