docs: function log(txt) {
            var p = document.createElement("p");
            p.style.margin = '2px';
            p.style.padding = '1px';
            p.style.backgroundColor = "#FFFFF0";
            p.style.border = "solid";
            p.style.borderWidth = "1px";
            p.style.borderColor = "#7F7F8F";
            p.style.lineHeight = "1.0";
            p.appendChild(document.createTextNode(txt));
            document.body.appendChild(p);
          }