code: function () {
              var styles = document.head.getElementsByTagName("style");
              CHTMLSTYLES = styles[styles.length-1].innerHTML;
              this.pxPerInch    = 96;
              this.defaultEx    = 6;
              this.defaultEm    = 6 / CHTML.TEX.x_height * 1000;
              this.defaultWidth = 100;
            }
docs: Set up the default ex-size and width