docs: function findRoot(r) {
          r.selectors.forEach(function(s) {
  
            // look for 'html' selectors
            if (regexHtml.test(s)) {
  
              r.declarations.forEach(function(d) {
                var foundSize = false;
  
                // look for the 'font' property
                if (d.property === 'font' && regexFont.test(d.value)) {
                  foundSize = d.value.match(regexFont)[1];
                }
  
                // look for the 'font-size' property
                else if (d.property === 'font-size') {
                  foundSize = d.value;
                }
  
                // update root size if new one is found
                if (foundSize) {
                  rootSize = createBaseSize(foundSize);
                }
              });
            }
          });
        }