code: function getLineHeight(elem) {
          var lh = computeStyle(elem, 'line-height');
          if (lh == 'normal') {
            // Normal line heights vary from browser to browser. The spec recommends
            // a value between 1.0 and 1.2 of the font size. Using 1.1 to split the diff.
            lh = parseInt(computeStyle(elem, 'font-size')) * 1.2;
          }
          return parseInt(lh);
        }
docs: Returns the line-height of an element as an integer.